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+# encoding: US-ASCII
+# frozen_string_literal: true
+# = csv.rb -- CSV Reading and Writing
+#
+# Created by James Edward Gray II on 2005-10-31.
+#
+# See CSV for documentation.
+#
+# == Description
+#
+# Welcome to the new and improved CSV.
+#
+# This version of the CSV library began its life as FasterCSV. FasterCSV was
+# intended as a replacement to Ruby's then standard CSV library. It was
+# designed to address concerns users of that library had and it had three
+# primary goals:
+#
+# 1.  Be significantly faster than CSV while remaining a pure Ruby library.
+# 2.  Use a smaller and easier to maintain code base. (FasterCSV eventually
+#     grew larger, was also but considerably richer in features. The parsing
+#     core remains quite small.)
+# 3.  Improve on the CSV interface.
+#
+# Obviously, the last one is subjective. I did try to defer to the original
+# interface whenever I didn't have a compelling reason to change it though, so
+# hopefully this won't be too radically different.
+#
+# We must have met our goals because FasterCSV was renamed to CSV and replaced
+# the original library as of Ruby 1.9. If you are migrating code from 1.8 or
+# earlier, you may have to change your code to comply with the new interface.
+#
+# == What's the Different From the Old CSV?
+#
+# I'm sure I'll miss something, but I'll try to mention most of the major
+# differences I am aware of, to help others quickly get up to speed:
+#
+# === \CSV Parsing
+#
+# * This parser is m17n aware. See CSV for full details.
+# * This library has a stricter parser and will throw MalformedCSVErrors on
+#   problematic data.
+# * This library has a less liberal idea of a line ending than CSV. What you
+#   set as the <tt>:row_sep</tt> is law. It can auto-detect your line endings
+#   though.
+# * The old library returned empty lines as <tt>[nil]</tt>. This library calls
+#   them <tt>[]</tt>.
+# * This library has a much faster parser.
+#
+# === Interface
+#
+# * CSV now uses keyword parameters to set options.
+# * CSV no longer has generate_row() or parse_row().
+# * The old CSV's Reader and Writer classes have been dropped.
+# * CSV::open() is now more like Ruby's open().
+# * CSV objects now support most standard IO methods.
+# * CSV now has a new() method used to wrap objects like String and IO for
+#   reading and writing.
+# * CSV::generate() is different from the old method.
+# * CSV no longer supports partial reads. It works line-by-line.
+# * CSV no longer allows the instance methods to override the separators for
+#   performance reasons. They must be set in the constructor.
+#
+# If you use this library and find yourself missing any functionality I have
+# trimmed, please {let me know}[mailto:james@grayproductions.net].
+#
+# == Documentation
+#
+# See CSV for documentation.
+#
+# == What is CSV, really?
+#
+# CSV maintains a pretty strict definition of CSV taken directly from
+# {the RFC}[https://www.ietf.org/rfc/rfc4180.txt]. I relax the rules in only one
+# place and that is to make using this library easier. CSV will parse all valid
+# CSV.
+#
+# What you don't want to do is to feed CSV invalid data. Because of the way the
+# CSV format works, it's common for a parser to need to read until the end of
+# the file to be sure a field is invalid. This consumes a lot of time and memory.
+#
+# Luckily, when working with invalid CSV, Ruby's built-in methods will almost
+# always be superior in every way. For example, parsing non-quoted fields is as
+# easy as:
+#
+#   data.split(",")
+#
+# == Questions and/or Comments
+#
+# Feel free to email {James Edward Gray II}[mailto:james@grayproductions.net]
+# with any questions.
+
+require "forwardable"
+require "date"
+require "time"
+require "stringio"
+
+require_relative "csv/fields_converter"
+require_relative "csv/input_record_separator"
+require_relative "csv/parser"
+require_relative "csv/row"
+require_relative "csv/table"
+require_relative "csv/writer"
+
+# == \CSV
+#
+# === \CSV Data
+#
+# \CSV (comma-separated values) data is a text representation of a table:
+# - A _row_ _separator_ delimits table rows.
+#   A common row separator is the newline character <tt>"\n"</tt>.
+# - A _column_ _separator_ delimits fields in a row.
+#   A common column separator is the comma character <tt>","</tt>.
+#
+# This \CSV \String, with row separator <tt>"\n"</tt>
+# and column separator <tt>","</tt>,
+# has three rows and two columns:
+#   "foo,0\nbar,1\nbaz,2\n"
+#
+# Despite the name \CSV, a \CSV representation can use different separators.
+#
+# For more about tables, see the Wikipedia article
+# "{Table (information)}[https://en.wikipedia.org/wiki/Table_(information)]",
+# especially its section
+# "{Simple table}[https://en.wikipedia.org/wiki/Table_(information)#Simple_table]"
+#
+# == \Class \CSV
+#
+# Class \CSV provides methods for:
+# - Parsing \CSV data from a \String object, a \File (via its file path), or an \IO object.
+# - Generating \CSV data to a \String object.
+#
+# To make \CSV available:
+#   require 'csv'
+#
+# All examples here assume that this has been done.
+#
+# == Keeping It Simple
+#
+# A \CSV object has dozens of instance methods that offer fine-grained control
+# of parsing and generating \CSV data.
+# For many needs, though, simpler approaches will do.
+#
+# This section summarizes the singleton methods in \CSV
+# that allow you to parse and generate without explicitly
+# creating \CSV objects.
+# For details, follow the links.
+#
+# === Simple Parsing
+#
+# Parsing methods commonly return either of:
+# - An \Array of Arrays of Strings:
+#   - The outer \Array is the entire "table".
+#   - Each inner \Array is a row.
+#   - Each \String is a field.
+# - A CSV::Table object.  For details, see
+#   {\CSV with Headers}[#class-CSV-label-CSV+with+Headers].
+#
+# ==== Parsing a \String
+#
+# The input to be parsed can be a string:
+#   string = "foo,0\nbar,1\nbaz,2\n"
+#
+# \Method CSV.parse returns the entire \CSV data:
+#   CSV.parse(string) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# \Method CSV.parse_line returns only the first row:
+#   CSV.parse_line(string) # => ["foo", "0"]
+#
+# \CSV extends class \String with instance method String#parse_csv,
+# which also returns only the first row:
+#   string.parse_csv # => ["foo", "0"]
+#
+# ==== Parsing Via a \File Path
+#
+# The input to be parsed can be in a file:
+#   string = "foo,0\nbar,1\nbaz,2\n"
+#   path = 't.csv'
+#   File.write(path, string)
+#
+# \Method CSV.read returns the entire \CSV data:
+#  CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# \Method CSV.foreach iterates, passing each row to the given block:
+#  CSV.foreach(path) do |row|
+#    p row
+#  end
+# Output:
+#   ["foo", "0"]
+#   ["bar", "1"]
+#   ["baz", "2"]
+#
+# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
+#   CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:3>
+#
+# ==== Parsing from an Open \IO Stream
+#
+# The input to be parsed can be in an open \IO stream:
+#
+# \Method CSV.read returns the entire \CSV data:
+#   File.open(path) do |file|
+#     CSV.read(file)
+#   end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# As does method CSV.parse:
+#   File.open(path) do |file|
+#     CSV.parse(file)
+#   end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# \Method CSV.parse_line returns only the first row:
+#   File.open(path) do |file|
+#    CSV.parse_line(file)
+#   end # => ["foo", "0"]
+#
+# \Method CSV.foreach iterates, passing each row to the given block:
+#   File.open(path) do |file|
+#     CSV.foreach(file) do |row|
+#       p row
+#     end
+#   end
+# Output:
+#   ["foo", "0"]
+#   ["bar", "1"]
+#   ["baz", "2"]
+#
+# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
+#   File.open(path) do |file|
+#     CSV.table(file)
+#   end # => #<CSV::Table mode:col_or_row row_count:3>
+#
+# === Simple Generating
+#
+# \Method CSV.generate returns a \String;
+# this example uses method CSV#<< to append the rows
+# that are to be generated:
+#   output_string = CSV.generate do |csv|
+#     csv << ['foo', 0]
+#     csv << ['bar', 1]
+#     csv << ['baz', 2]
+#   end
+#   output_string # => "foo,0\nbar,1\nbaz,2\n"
+#
+# \Method CSV.generate_line returns a \String containing the single row
+# constructed from an \Array:
+#   CSV.generate_line(['foo', '0']) # => "foo,0\n"
+#
+# \CSV extends class \Array with instance method <tt>Array#to_csv</tt>,
+# which forms an \Array into a \String:
+#   ['foo', '0'].to_csv # => "foo,0\n"
+#
+# === "Filtering" \CSV
+#
+# \Method CSV.filter provides a Unix-style filter for \CSV data.
+# The input data is processed to form the output data:
+#   in_string = "foo,0\nbar,1\nbaz,2\n"
+#   out_string = ''
+#   CSV.filter(in_string, out_string) do |row|
+#     row[0] = row[0].upcase
+#     row[1] *= 4
+#   end
+#   out_string # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
+#
+# == \CSV Objects
+#
+# There are three ways to create a \CSV object:
+# - \Method CSV.new returns a new \CSV object.
+# - \Method CSV.instance returns a new or cached \CSV object.
+# - \Method \CSV() also returns a new or cached \CSV object.
+#
+# === Instance Methods
+#
+# \CSV has three groups of instance methods:
+# - Its own internally defined instance methods.
+# - Methods included by module Enumerable.
+# - Methods delegated to class IO. See below.
+#
+# ==== Delegated Methods
+#
+# For convenience, a CSV object will delegate to many methods in class IO.
+# (A few have wrapper "guard code" in \CSV.) You may call:
+# * IO#binmode
+# * #binmode?
+# * IO#close
+# * IO#close_read
+# * IO#close_write
+# * IO#closed?
+# * #eof
+# * #eof?
+# * IO#external_encoding
+# * IO#fcntl
+# * IO#fileno
+# * #flock
+# * IO#flush
+# * IO#fsync
+# * IO#internal_encoding
+# * #ioctl
+# * IO#isatty
+# * #path
+# * IO#pid
+# * IO#pos
+# * IO#pos=
+# * IO#reopen
+# * #rewind
+# * IO#seek
+# * #stat
+# * IO#string
+# * IO#sync
+# * IO#sync=
+# * IO#tell
+# * #to_i
+# * #to_io
+# * IO#truncate
+# * IO#tty?
+#
+# === Options
+#
+# The default values for options are:
+#   DEFAULT_OPTIONS = {
+#     # For both parsing and generating.
+#     col_sep:            ",",
+#     row_sep:            :auto,
+#     quote_char:         '"',
+#     # For parsing.
+#     field_size_limit:   nil,
+#     converters:         nil,
+#     unconverted_fields: nil,
+#     headers:            false,
+#     return_headers:     false,
+#     header_converters:  nil,
+#     skip_blanks:        false,
+#     skip_lines:         nil,
+#     liberal_parsing:    false,
+#     nil_value:          nil,
+#     empty_value:        "",
+#     strip:              false,
+#     # For generating.
+#     write_headers:      nil,
+#     quote_empty:        true,
+#     force_quotes:       false,
+#     write_converters:   nil,
+#     write_nil_value:    nil,
+#     write_empty_value:  "",
+#   }
+#
+# ==== Options for Parsing
+#
+# Options for parsing, described in detail below, include:
+# - +row_sep+: Specifies the row separator; used to delimit rows.
+# - +col_sep+: Specifies the column separator; used to delimit fields.
+# - +quote_char+: Specifies the quote character; used to quote fields.
+# - +field_size_limit+: Specifies the maximum field size + 1 allowed.
+#   Deprecated since 3.2.3. Use +max_field_size+ instead.
+# - +max_field_size+: Specifies the maximum field size allowed.
+# - +converters+: Specifies the field converters to be used.
+# - +unconverted_fields+: Specifies whether unconverted fields are to be available.
+# - +headers+: Specifies whether data contains headers,
+#   or specifies the headers themselves.
+# - +return_headers+: Specifies whether headers are to be returned.
+# - +header_converters+: Specifies the header converters to be used.
+# - +skip_blanks+: Specifies whether blanks lines are to be ignored.
+# - +skip_lines+: Specifies how comments lines are to be recognized.
+# - +strip+: Specifies whether leading and trailing whitespace are to be
+#   stripped from fields. This must be compatible with +col_sep+; if it is not,
+#   then an +ArgumentError+ exception will be raised.
+# - +liberal_parsing+: Specifies whether \CSV should attempt to parse
+#   non-compliant data.
+# - +nil_value+: Specifies the object that is to be substituted for each null (no-text) field.
+# - +empty_value+: Specifies the object that is to be substituted for each empty field.
+#
+# :include: ../doc/csv/options/common/row_sep.rdoc
+#
+# :include: ../doc/csv/options/common/col_sep.rdoc
+#
+# :include: ../doc/csv/options/common/quote_char.rdoc
+#
+# :include: ../doc/csv/options/parsing/field_size_limit.rdoc
+#
+# :include: ../doc/csv/options/parsing/converters.rdoc
+#
+# :include: ../doc/csv/options/parsing/unconverted_fields.rdoc
+#
+# :include: ../doc/csv/options/parsing/headers.rdoc
+#
+# :include: ../doc/csv/options/parsing/return_headers.rdoc
+#
+# :include: ../doc/csv/options/parsing/header_converters.rdoc
+#
+# :include: ../doc/csv/options/parsing/skip_blanks.rdoc
+#
+# :include: ../doc/csv/options/parsing/skip_lines.rdoc
+#
+# :include: ../doc/csv/options/parsing/strip.rdoc
+#
+# :include: ../doc/csv/options/parsing/liberal_parsing.rdoc
+#
+# :include: ../doc/csv/options/parsing/nil_value.rdoc
+#
+# :include: ../doc/csv/options/parsing/empty_value.rdoc
+#
+# ==== Options for Generating
+#
+# Options for generating, described in detail below, include:
+# - +row_sep+: Specifies the row separator; used to delimit rows.
+# - +col_sep+: Specifies the column separator; used to delimit fields.
+# - +quote_char+: Specifies the quote character; used to quote fields.
+# - +write_headers+: Specifies whether headers are to be written.
+# - +force_quotes+: Specifies whether each output field is to be quoted.
+# - +quote_empty+: Specifies whether each empty output field is to be quoted.
+# - +write_converters+: Specifies the field converters to be used in writing.
+# - +write_nil_value+: Specifies the object that is to be substituted for each +nil+-valued field.
+# - +write_empty_value+: Specifies the object that is to be substituted for each empty field.
+#
+# :include: ../doc/csv/options/common/row_sep.rdoc
+#
+# :include: ../doc/csv/options/common/col_sep.rdoc
+#
+# :include: ../doc/csv/options/common/quote_char.rdoc
+#
+# :include: ../doc/csv/options/generating/write_headers.rdoc
+#
+# :include: ../doc/csv/options/generating/force_quotes.rdoc
+#
+# :include: ../doc/csv/options/generating/quote_empty.rdoc
+#
+# :include: ../doc/csv/options/generating/write_converters.rdoc
+#
+# :include: ../doc/csv/options/generating/write_nil_value.rdoc
+#
+# :include: ../doc/csv/options/generating/write_empty_value.rdoc
+#
+# === \CSV with Headers
+#
+# CSV allows to specify column names of CSV file, whether they are in data, or
+# provided separately. If headers are specified, reading methods return an instance
+# of CSV::Table, consisting of CSV::Row.
+#
+#   # Headers are part of data
+#   data = CSV.parse(<<~ROWS, headers: true)
+#     Name,Department,Salary
+#     Bob,Engineering,1000
+#     Jane,Sales,2000
+#     John,Management,5000
+#   ROWS
+#
+#   data.class      #=> CSV::Table
+#   data.first      #=> #<CSV::Row "Name":"Bob" "Department":"Engineering" "Salary":"1000">
+#   data.first.to_h #=> {"Name"=>"Bob", "Department"=>"Engineering", "Salary"=>"1000"}
+#
+#   # Headers provided by developer
+#   data = CSV.parse('Bob,Engineering,1000', headers: %i[name department salary])
+#   data.first      #=> #<CSV::Row name:"Bob" department:"Engineering" salary:"1000">
+#
+# === \Converters
+#
+# By default, each value (field or header) parsed by \CSV is formed into a \String.
+# You can use a _field_ _converter_ or  _header_ _converter_
+# to intercept and modify the parsed values:
+# - See {Field Converters}[#class-CSV-label-Field+Converters].
+# - See {Header Converters}[#class-CSV-label-Header+Converters].
+#
+# Also by default, each value to be written during generation is written 'as-is'.
+# You can use a _write_ _converter_ to modify values before writing.
+# - See {Write Converters}[#class-CSV-label-Write+Converters].
+#
+# ==== Specifying \Converters
+#
+# You can specify converters for parsing or generating in the +options+
+# argument to various \CSV methods:
+# - Option +converters+ for converting parsed field values.
+# - Option +header_converters+ for converting parsed header values.
+# - Option +write_converters+ for converting values to be written (generated).
+#
+# There are three forms for specifying converters:
+# - A converter proc: executable code to be used for conversion.
+# - A converter name: the name of a stored converter.
+# - A converter list: an array of converter procs, converter names, and converter lists.
+#
+# ===== Converter Procs
+#
+# This converter proc, +strip_converter+, accepts a value +field+
+# and returns <tt>field.strip</tt>:
+#   strip_converter = proc {|field| field.strip }
+# In this call to <tt>CSV.parse</tt>,
+# the keyword argument <tt>converters: string_converter</tt>
+# specifies that:
+# - \Proc +string_converter+ is to be called for each parsed field.
+# - The converter's return value is to replace the +field+ value.
+# Example:
+#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
+#   array = CSV.parse(string, converters: strip_converter)
+#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# A converter proc can receive a second argument, +field_info+,
+# that contains details about the field.
+# This modified +strip_converter+ displays its arguments:
+#   strip_converter = proc do |field, field_info|
+#     p [field, field_info]
+#     field.strip
+#   end
+#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
+#   array = CSV.parse(string, converters: strip_converter)
+#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+# Output:
+#  [" foo ", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
+#  [" 0 ", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
+#  [" bar ", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
+#  [" 1 ", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
+#  [" baz ", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
+#  [" 2 ", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
+# Each CSV::FieldInfo object shows:
+# - The 0-based field index.
+# - The 1-based line index.
+# - The field header, if any.
+#
+# ===== Stored \Converters
+#
+# A converter may be given a name and stored in a structure where
+# the parsing methods can find it by name.
+#
+# The storage structure for field converters is the \Hash CSV::Converters.
+# It has several built-in converter procs:
+# - <tt>:integer</tt>: converts each \String-embedded integer into a true \Integer.
+# - <tt>:float</tt>: converts each \String-embedded float into a true \Float.
+# - <tt>:date</tt>: converts each \String-embedded date into a true \Date.
+# - <tt>:date_time</tt>: converts each \String-embedded date-time into a true \DateTime
+# - <tt>:time</tt>: converts each \String-embedded time into a true \Time
+# .
+# This example creates a converter proc, then stores it:
+#   strip_converter = proc {|field| field.strip }
+#   CSV::Converters[:strip] = strip_converter
+# Then the parsing method call can refer to the converter
+# by its name, <tt>:strip</tt>:
+#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
+#   array = CSV.parse(string, converters: :strip)
+#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# The storage structure for header converters is the \Hash CSV::HeaderConverters,
+# which works in the same way.
+# It also has built-in converter procs:
+# - <tt>:downcase</tt>: Downcases each header.
+# - <tt>:symbol</tt>: Converts each header to a \Symbol.
+#
+# There is no such storage structure for write headers.
+#
+# In order for the parsing methods to access stored converters in non-main-Ractors, the
+# storage structure must be made shareable first.
+# Therefore, <tt>Ractor.make_shareable(CSV::Converters)</tt> and
+# <tt>Ractor.make_shareable(CSV::HeaderConverters)</tt> must be called before the creation
+# of Ractors that use the converters stored in these structures. (Since making the storage
+# structures shareable involves freezing them, any custom converters that are to be used
+# must be added first.)
+#
+# ===== Converter Lists
+#
+# A _converter_ _list_ is an \Array that may include any assortment of:
+# - Converter procs.
+# - Names of stored converters.
+# - Nested converter lists.
+#
+# Examples:
+#   numeric_converters = [:integer, :float]
+#   date_converters = [:date, :date_time]
+#   [numeric_converters, strip_converter]
+#   [strip_converter, date_converters, :float]
+#
+# Like a converter proc, a converter list may be named and stored in either
+# \CSV::Converters or CSV::HeaderConverters:
+#   CSV::Converters[:custom] = [strip_converter, date_converters, :float]
+#   CSV::HeaderConverters[:custom] = [:downcase, :symbol]
+#
+# There are two built-in converter lists:
+#   CSV::Converters[:numeric] # => [:integer, :float]
+#   CSV::Converters[:all] # => [:date_time, :numeric]
+#
+# ==== Field \Converters
+#
+# With no conversion, all parsed fields in all rows become Strings:
+#   string = "foo,0\nbar,1\nbaz,2\n"
+#   ary = CSV.parse(string)
+#   ary # => # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# When you specify a field converter, each parsed field is passed to the converter;
+# its return value becomes the stored value for the field.
+# A converter might, for example, convert an integer embedded in a \String
+# into a true \Integer.
+# (In fact, that's what built-in field converter +:integer+ does.)
+#
+# There are three ways to use field \converters.
+#
+# - Using option {converters}[#class-CSV-label-Option+converters] with a parsing method:
+#     ary = CSV.parse(string, converters: :integer)
+#     ary # => [0, 1, 2] # => [["foo", 0], ["bar", 1], ["baz", 2]]
+# - Using option {converters}[#class-CSV-label-Option+converters] with a new \CSV instance:
+#     csv = CSV.new(string, converters: :integer)
+#     # Field converters in effect:
+#     csv.converters # => [:integer]
+#     csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
+# - Using method #convert to add a field converter to a \CSV instance:
+#     csv = CSV.new(string)
+#     # Add a converter.
+#     csv.convert(:integer)
+#     csv.converters # => [:integer]
+#     csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
+#
+# Installing a field converter does not affect already-read rows:
+#   csv = CSV.new(string)
+#   csv.shift # => ["foo", "0"]
+#   # Add a converter.
+#   csv.convert(:integer)
+#   csv.converters # => [:integer]
+#   csv.read # => [["bar", 1], ["baz", 2]]
+#
+# There are additional built-in \converters, and custom \converters are also supported.
+#
+# ===== Built-In Field \Converters
+#
+# The built-in field converters are in \Hash CSV::Converters:
+# - Each key is a field converter name.
+# - Each value is one of:
+#   - A \Proc field converter.
+#   - An \Array of field converter names.
+#
+# Display:
+#   CSV::Converters.each_pair do |name, value|
+#     if value.kind_of?(Proc)
+#       p [name, value.class]
+#     else
+#       p [name, value]
+#     end
+#   end
+# Output:
+#   [:integer, Proc]
+#   [:float, Proc]
+#   [:numeric, [:integer, :float]]
+#   [:date, Proc]
+#   [:date_time, Proc]
+#   [:time, Proc]
+#   [:all, [:date_time, :numeric]]
+#
+# Each of these converters transcodes values to UTF-8 before attempting conversion.
+# If a value cannot be transcoded to UTF-8 the conversion will
+# fail and the value will remain unconverted.
+#
+# Converter +:integer+ converts each field that Integer() accepts:
+#   data = '0,1,2,x'
+#   # Without the converter
+#   csv = CSV.parse_line(data)
+#   csv # => ["0", "1", "2", "x"]
+#   # With the converter
+#   csv = CSV.parse_line(data, converters: :integer)
+#   csv # => [0, 1, 2, "x"]
+#
+# Converter +:float+ converts each field that Float() accepts:
+#   data = '1.0,3.14159,x'
+#   # Without the converter
+#   csv = CSV.parse_line(data)
+#   csv # => ["1.0", "3.14159", "x"]
+#   # With the converter
+#   csv = CSV.parse_line(data, converters: :float)
+#   csv # => [1.0, 3.14159, "x"]
+#
+# Converter +:numeric+ converts with both +:integer+ and +:float+..
+#
+# Converter +:date+ converts each field that Date::parse accepts:
+#   data = '2001-02-03,x'
+#   # Without the converter
+#   csv = CSV.parse_line(data)
+#   csv # => ["2001-02-03", "x"]
+#   # With the converter
+#   csv = CSV.parse_line(data, converters: :date)
+#   csv # => [#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>, "x"]
+#
+# Converter +:date_time+ converts each field that DateTime::parse accepts:
+#   data = '2020-05-07T14:59:00-05:00,x'
+#   # Without the converter
+#   csv = CSV.parse_line(data)
+#   csv # => ["2020-05-07T14:59:00-05:00", "x"]
+#   # With the converter
+#   csv = CSV.parse_line(data, converters: :date_time)
+#   csv # => [#<DateTime: 2020-05-07T14:59:00-05:00 ((2458977j,71940s,0n),-18000s,2299161j)>, "x"]
+#
+# Converter +time+ converts each field that Time::parse accepts:
+#   data = '2020-05-07T14:59:00-05:00,x'
+#   # Without the converter
+#   csv = CSV.parse_line(data)
+#   csv # => ["2020-05-07T14:59:00-05:00", "x"]
+#   # With the converter
+#   csv = CSV.parse_line(data, converters: :time)
+#   csv # => [2020-05-07 14:59:00 -0500, "x"]
+#
+# Converter +:numeric+ converts with both +:date_time+ and +:numeric+..
+#
+# As seen above, method #convert adds \converters to a \CSV instance,
+# and method #converters returns an \Array of the \converters in effect:
+#   csv = CSV.new('0,1,2')
+#   csv.converters # => []
+#   csv.convert(:integer)
+#   csv.converters # => [:integer]
+#   csv.convert(:date)
+#   csv.converters # => [:integer, :date]
+#
+# ===== Custom Field \Converters
+#
+# You can define a custom field converter:
+#   strip_converter = proc {|field| field.strip }
+#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
+#   array = CSV.parse(string, converters: strip_converter)
+#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+# You can register the converter in \Converters \Hash,
+# which allows you to refer to it by name:
+#   CSV::Converters[:strip] = strip_converter
+#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
+#   array = CSV.parse(string, converters: :strip)
+#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+#
+# ==== Header \Converters
+#
+# Header converters operate only on headers (and not on other rows).
+#
+# There are three ways to use header \converters;
+# these examples use built-in header converter +:downcase+,
+# which downcases each parsed header.
+#
+# - Option +header_converters+ with a singleton parsing method:
+#     string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
+#     tbl = CSV.parse(string, headers: true, header_converters: :downcase)
+#     tbl.class # => CSV::Table
+#     tbl.headers # => ["name", "count"]
+#
+# - Option +header_converters+ with a new \CSV instance:
+#     csv = CSV.new(string, header_converters: :downcase)
+#     # Header converters in effect:
+#     csv.header_converters # => [:downcase]
+#     tbl = CSV.parse(string, headers: true)
+#     tbl.headers # => ["Name", "Count"]
+#
+# - Method #header_convert adds a header converter to a \CSV instance:
+#     csv = CSV.new(string)
+#     # Add a header converter.
+#     csv.header_convert(:downcase)
+#     csv.header_converters # => [:downcase]
+#     tbl = CSV.parse(string, headers: true)
+#     tbl.headers # => ["Name", "Count"]
+#
+# ===== Built-In Header \Converters
+#
+# The built-in header \converters are in \Hash CSV::HeaderConverters.
+# The keys there are the names of the \converters:
+#   CSV::HeaderConverters.keys # => [:downcase, :symbol]
+#
+# Converter +:downcase+ converts each header by downcasing it:
+#   string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
+#   tbl = CSV.parse(string, headers: true, header_converters: :downcase)
+#   tbl.class # => CSV::Table
+#   tbl.headers # => ["name", "count"]
+#
+# Converter +:symbol+ converts each header by making it into a \Symbol:
+#   string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
+#   tbl = CSV.parse(string, headers: true, header_converters: :symbol)
+#   tbl.headers # => [:name, :count]
+# Details:
+# - Strips leading and trailing whitespace.
+# - Downcases the header.
+# - Replaces embedded spaces with underscores.
+# - Removes non-word characters.
+# - Makes the string into a \Symbol.
+#
+# ===== Custom Header \Converters
+#
+# You can define a custom header converter:
+#   upcase_converter = proc {|header| header.upcase }
+#   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+#   table = CSV.parse(string, headers: true, header_converters: upcase_converter)
+#   table # => #<CSV::Table mode:col_or_row row_count:4>
+#   table.headers # => ["NAME", "VALUE"]
+# You can register the converter in \HeaderConverters \Hash,
+# which allows you to refer to it by name:
+#   CSV::HeaderConverters[:upcase] = upcase_converter
+#   table = CSV.parse(string, headers: true, header_converters: :upcase)
+#   table # => #<CSV::Table mode:col_or_row row_count:4>
+#   table.headers # => ["NAME", "VALUE"]
+#
+# ===== Write \Converters
+#
+# When you specify a write converter for generating \CSV,
+# each field to be written is passed to the converter;
+# its return value becomes the new value for the field.
+# A converter might, for example, strip whitespace from a field.
+#
+# Using no write converter (all fields unmodified):
+#   output_string = CSV.generate do |csv|
+#     csv << [' foo ', 0]
+#     csv << [' bar ', 1]
+#     csv << [' baz ', 2]
+#   end
+#   output_string # => " foo ,0\n bar ,1\n baz ,2\n"
+# Using option +write_converters+ with two custom write converters:
+#   strip_converter = proc {|field| field.respond_to?(:strip) ? field.strip : field }
+#   upcase_converter = proc {|field| field.respond_to?(:upcase) ? field.upcase : field }
+#   write_converters = [strip_converter, upcase_converter]
+#   output_string = CSV.generate(write_converters: write_converters) do |csv|
+#     csv << [' foo ', 0]
+#     csv << [' bar ', 1]
+#     csv << [' baz ', 2]
+#   end
+#   output_string # => "FOO,0\nBAR,1\nBAZ,2\n"
+#
+# === Character Encodings (M17n or Multilingualization)
+#
+# This new CSV parser is m17n savvy.  The parser works in the Encoding of the IO
+# or String object being read from or written to. Your data is never transcoded
+# (unless you ask Ruby to transcode it for you) and will literally be parsed in
+# the Encoding it is in. Thus CSV will return Arrays or Rows of Strings in the
+# Encoding of your data. This is accomplished by transcoding the parser itself
+# into your Encoding.
+#
+# Some transcoding must take place, of course, to accomplish this multiencoding
+# support. For example, <tt>:col_sep</tt>, <tt>:row_sep</tt>, and
+# <tt>:quote_char</tt> must be transcoded to match your data.  Hopefully this
+# makes the entire process feel transparent, since CSV's defaults should just
+# magically work for your data. However, you can set these values manually in
+# the target Encoding to avoid the translation.
+#
+# It's also important to note that while all of CSV's core parser is now
+# Encoding agnostic, some features are not. For example, the built-in
+# converters will try to transcode data to UTF-8 before making conversions.
+# Again, you can provide custom converters that are aware of your Encodings to
+# avoid this translation. It's just too hard for me to support native
+# conversions in all of Ruby's Encodings.
+#
+# Anyway, the practical side of this is simple: make sure IO and String objects
+# passed into CSV have the proper Encoding set and everything should just work.
+# CSV methods that allow you to open IO objects (CSV::foreach(), CSV::open(),
+# CSV::read(), and CSV::readlines()) do allow you to specify the Encoding.
+#
+# One minor exception comes when generating CSV into a String with an Encoding
+# that is not ASCII compatible. There's no existing data for CSV to use to
+# prepare itself and thus you will probably need to manually specify the desired
+# Encoding for most of those cases. It will try to guess using the fields in a
+# row of output though, when using CSV::generate_line() or Array#to_csv().
+#
+# I try to point out any other Encoding issues in the documentation of methods
+# as they come up.
+#
+# This has been tested to the best of my ability with all non-"dummy" Encodings
+# Ruby ships with. However, it is brave new code and may have some bugs.
+# Please feel free to {report}[mailto:james@grayproductions.net] any issues you
+# find with it.
+#
+class CSV
+
+  # The error thrown when the parser encounters illegal CSV formatting.
+  class MalformedCSVError < RuntimeError
+    attr_reader :line_number
+    alias_method :lineno, :line_number
+    def initialize(message, line_number)
+      @line_number = line_number
+      super("#{message} in line #{line_number}.")
+    end
+  end
+
+  # The error thrown when the parser encounters invalid encoding in CSV.
+  class InvalidEncodingError < MalformedCSVError
+    attr_reader :encoding
+    def initialize(encoding, line_number)
+      @encoding = encoding
+      super("Invalid byte sequence in #{encoding}", line_number)
+    end
+  end
+
+  #
+  # A FieldInfo Struct contains details about a field's position in the data
+  # source it was read from.  CSV will pass this Struct to some blocks that make
+  # decisions based on field structure.  See CSV.convert_fields() for an
+  # example.
+  #
+  # <b><tt>index</tt></b>::  The zero-based index of the field in its row.
+  # <b><tt>line</tt></b>::   The line of the data source this row is from.
+  # <b><tt>header</tt></b>:: The header for the column, when available.
+  # <b><tt>quoted?</tt></b>:: True or false, whether the original value is quoted or not.
+  #
+  FieldInfo = Struct.new(:index, :line, :header, :quoted?)
+
+  # A Regexp used to find and convert some common Date formats.
+  DateMatcher     = / \A(?: (\w+,?\s+)?\w+\s+\d{1,2},?\s+\d{2,4} |
+                            \d{4}-\d{2}-\d{2} )\z /x
+  # A Regexp used to find and convert some common (Date)Time formats.
+  DateTimeMatcher =
+    / \A(?: (\w+,?\s+)?\w+\s+\d{1,2}\s+\d{1,2}:\d{1,2}:\d{1,2},?\s+\d{2,4} |
+            # ISO-8601 and RFC-3339 (space instead of T) recognized by (Date)Time.parse
+            \d{4}-\d{2}-\d{2}
+              (?:[T\s]\d{2}:\d{2}(?::\d{2}(?:\.\d+)?(?:[+-]\d{2}(?::\d{2})|Z)?)?)?
+        )\z /x
+
+  # The encoding used by all converters.
+  ConverterEncoding = Encoding.find("UTF-8")
+
+  # A \Hash containing the names and \Procs for the built-in field converters.
+  # See {Built-In Field Converters}[#class-CSV-label-Built-In+Field+Converters].
+  #
+  # This \Hash is intentionally left unfrozen, and may be extended with
+  # custom field converters.
+  # See {Custom Field Converters}[#class-CSV-label-Custom+Field+Converters].
+  Converters  = {
+    integer:   lambda { |f|
+      Integer(f.encode(ConverterEncoding)) rescue f
+    },
+    float:     lambda { |f|
+      Float(f.encode(ConverterEncoding)) rescue f
+    },
+    numeric:   [:integer, :float],
+    date:      lambda { |f|
+      begin
+        e = f.encode(ConverterEncoding)
+        e.match?(DateMatcher) ? Date.parse(e) : f
+      rescue  # encoding conversion or date parse errors
+        f
+      end
+    },
+    date_time: lambda { |f|
+      begin
+        e = f.encode(ConverterEncoding)
+        e.match?(DateTimeMatcher) ? DateTime.parse(e) : f
+      rescue  # encoding conversion or date parse errors
+        f
+      end
+    },
+    time: lambda { |f|
+      begin
+        e = f.encode(ConverterEncoding)
+        e.match?(DateTimeMatcher) ? Time.parse(e) : f
+      rescue  # encoding conversion or parse errors
+        f
+      end
+    },
+    all:       [:date_time, :numeric],
+  }
+
+  # A \Hash containing the names and \Procs for the built-in header converters.
+  # See {Built-In Header Converters}[#class-CSV-label-Built-In+Header+Converters].
+  #
+  # This \Hash is intentionally left unfrozen, and may be extended with
+  # custom field converters.
+  # See {Custom Header Converters}[#class-CSV-label-Custom+Header+Converters].
+  HeaderConverters = {
+    downcase: lambda { |h| h.encode(ConverterEncoding).downcase },
+    symbol:   lambda { |h|
+      h.encode(ConverterEncoding).downcase.gsub(/[^\s\w]+/, "").strip.
+                                           gsub(/\s+/, "_").to_sym
+    },
+    symbol_raw: lambda { |h| h.encode(ConverterEncoding).to_sym }
+  }
+
+  # Default values for method options.
+  DEFAULT_OPTIONS = {
+    # For both parsing and generating.
+    col_sep:            ",",
+    row_sep:            :auto,
+    quote_char:         '"',
+    # For parsing.
+    field_size_limit:   nil,
+    max_field_size:     nil,
+    converters:         nil,
+    unconverted_fields: nil,
+    headers:            false,
+    return_headers:     false,
+    header_converters:  nil,
+    skip_blanks:        false,
+    skip_lines:         nil,
+    liberal_parsing:    false,
+    nil_value:          nil,
+    empty_value:        "",
+    strip:              false,
+    # For generating.
+    write_headers:      nil,
+    quote_empty:        true,
+    force_quotes:       false,
+    write_converters:   nil,
+    write_nil_value:    nil,
+    write_empty_value:  "",
+  }.freeze
+
+  class << self
+    # :call-seq:
+    #   instance(string, **options)
+    #   instance(io = $stdout, **options)
+    #   instance(string, **options) {|csv| ... }
+    #   instance(io = $stdout, **options) {|csv| ... }
+    #
+    # Creates or retrieves cached \CSV objects.
+    # For arguments and options, see CSV.new.
+    #
+    # This API is not Ractor-safe.
+    #
+    # ---
+    #
+    # With no block given, returns a \CSV object.
+    #
+    # The first call to +instance+ creates and caches a \CSV object:
+    #   s0 = 's0'
+    #   csv0 = CSV.instance(s0)
+    #   csv0.class # => CSV
+    #
+    # Subsequent calls to +instance+ with that _same_ +string+ or +io+
+    # retrieve that same cached object:
+    #   csv1 = CSV.instance(s0)
+    #   csv1.class # => CSV
+    #   csv1.equal?(csv0) # => true # Same CSV object
+    #
+    # A subsequent call to +instance+ with a _different_ +string+ or +io+
+    # creates and caches a _different_ \CSV object.
+    #   s1 = 's1'
+    #   csv2 = CSV.instance(s1)
+    #   csv2.equal?(csv0) # => false # Different CSV object
+    #
+    # All the cached objects remains available:
+    #   csv3 = CSV.instance(s0)
+    #   csv3.equal?(csv0) # true # Same CSV object
+    #   csv4 = CSV.instance(s1)
+    #   csv4.equal?(csv2) # true # Same CSV object
+    #
+    # ---
+    #
+    # When a block is given, calls the block with the created or retrieved
+    # \CSV object; returns the block's return value:
+    #   CSV.instance(s0) {|csv| :foo } # => :foo
+    def instance(data = $stdout, **options)
+      # create a _signature_ for this method call, data object and options
+      sig = [data.object_id] +
+            options.values_at(*DEFAULT_OPTIONS.keys)
+
+      # fetch or create the instance for this signature
+      @@instances ||= Hash.new
+      instance = (@@instances[sig] ||= new(data, **options))
+
+      if block_given?
+        yield instance  # run block, if given, returning result
+      else
+        instance        # or return the instance
+      end
+    end
+
+    # :call-seq:
+    #   filter(in_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
+    #   filter(in_string_or_io, out_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
+    #   filter(**options) {|row| ... } -> array_of_arrays or csv_table
+    #
+    # - Parses \CSV from a source (\String, \IO stream, or ARGF).
+    # - Calls the given block with each parsed row:
+    #   - Without headers, each row is an \Array.
+    #   - With headers, each row is a CSV::Row.
+    # - Generates \CSV to an output (\String, \IO stream, or STDOUT).
+    # - Returns the parsed source:
+    #   - Without headers, an \Array of \Arrays.
+    #   - With headers, a CSV::Table.
+    #
+    # When +in_string_or_io+ is given, but not +out_string_or_io+,
+    # parses from the given +in_string_or_io+
+    # and generates to STDOUT.
+    #
+    # \String input without headers:
+    #
+    #   in_string = "foo,0\nbar,1\nbaz,2"
+    #   CSV.filter(in_string) do |row|
+    #     row[0].upcase!
+    #     row[1] = - row[1].to_i
+    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
+    #
+    # Output (to STDOUT):
+    #
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # \String input with headers:
+    #
+    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
+    #   CSV.filter(in_string, headers: true) do |row|
+    #     row[0].upcase!
+    #     row[1] = - row[1].to_i
+    #   end # => #<CSV::Table mode:col_or_row row_count:4>
+    #
+    # Output (to STDOUT):
+    #
+    #   Name,Value
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # \IO stream input without headers:
+    #
+    #   File.write('t.csv', "foo,0\nbar,1\nbaz,2")
+    #   File.open('t.csv') do |in_io|
+    #     CSV.filter(in_io) do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
+    #
+    # Output (to STDOUT):
+    #
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # \IO stream input with headers:
+    #
+    #   File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
+    #   File.open('t.csv') do |in_io|
+    #     CSV.filter(in_io, headers: true) do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   end # => #<CSV::Table mode:col_or_row row_count:4>
+    #
+    # Output (to STDOUT):
+    #
+    #   Name,Value
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # When both +in_string_or_io+ and +out_string_or_io+ are given,
+    # parses from +in_string_or_io+ and generates to +out_string_or_io+.
+    #
+    # \String output without headers:
+    #
+    #   in_string = "foo,0\nbar,1\nbaz,2"
+    #   out_string = ''
+    #   CSV.filter(in_string, out_string) do |row|
+    #     row[0].upcase!
+    #     row[1] = - row[1].to_i
+    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
+    #   out_string # => "FOO,0\nBAR,-1\nBAZ,-2\n"
+    #
+    # \String output with headers:
+    #
+    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
+    #   out_string = ''
+    #   CSV.filter(in_string, out_string, headers: true) do |row|
+    #     row[0].upcase!
+    #     row[1] = - row[1].to_i
+    #   end # => #<CSV::Table mode:col_or_row row_count:4>
+    #   out_string # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
+    #
+    # \IO stream output without headers:
+    #
+    #   in_string = "foo,0\nbar,1\nbaz,2"
+    #   File.open('t.csv', 'w') do |out_io|
+    #     CSV.filter(in_string, out_io) do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
+    #   File.read('t.csv') # => "FOO,0\nBAR,-1\nBAZ,-2\n"
+    #
+    # \IO stream output with headers:
+    #
+    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
+    #   File.open('t.csv', 'w') do |out_io|
+    #     CSV.filter(in_string, out_io, headers: true) do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   end # => #<CSV::Table mode:col_or_row row_count:4>
+    #   File.read('t.csv') # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
+    #
+    # When neither +in_string_or_io+ nor +out_string_or_io+ given,
+    # parses from {ARGF}[rdoc-ref:ARGF]
+    # and generates to STDOUT.
+    #
+    # Without headers:
+    #
+    #   # Put Ruby code into a file.
+    #   ruby = <<-EOT
+    #     require 'csv'
+    #     CSV.filter do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   EOT
+    #   File.write('t.rb', ruby)
+    #   # Put some CSV into a file.
+    #   File.write('t.csv', "foo,0\nbar,1\nbaz,2")
+    #   # Run the Ruby code with CSV filename as argument.
+    #   system(Gem.ruby, "t.rb", "t.csv")
+    #
+    # Output (to STDOUT):
+    #
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # With headers:
+    #
+    #   # Put Ruby code into a file.
+    #   ruby = <<-EOT
+    #     require 'csv'
+    #     CSV.filter(headers: true) do |row|
+    #       row[0].upcase!
+    #       row[1] = - row[1].to_i
+    #     end
+    #   EOT
+    #   File.write('t.rb', ruby)
+    #   # Put some CSV into a file.
+    #   File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
+    #   # Run the Ruby code with CSV filename as argument.
+    #   system(Gem.ruby, "t.rb", "t.csv")
+    #
+    # Output (to STDOUT):
+    #
+    #   Name,Value
+    #   FOO,0
+    #   BAR,-1
+    #   BAZ,-2
+    #
+    # Arguments:
+    #
+    # * Argument +in_string_or_io+ must be a \String or an \IO stream.
+    # * Argument +out_string_or_io+ must be a \String or an \IO stream.
+    # * Arguments <tt>**options</tt> must be keyword options.
+    #
+    #   - Each option defined as an {option for parsing}[#class-CSV-label-Options+for+Parsing]
+    #     is used for parsing the filter input.
+    #   - Each option defined as an {option for generating}[#class-CSV-label-Options+for+Generating]
+    #     is used for generator the filter input.
+    #
+    # However, there are three options that may be used for both parsing and generating:
+    # +col_sep+, +quote_char+, and +row_sep+.
+    #
+    # Therefore for method +filter+ (and method +filter+ only),
+    # there are special options that allow these parsing and generating options
+    # to be specified separately:
+    #
+    # - Options +input_col_sep+ and +output_col_sep+
+    #   (and their aliases +in_col_sep+ and +out_col_sep+)
+    #   specify the column separators for parsing and generating.
+    # - Options +input_quote_char+ and +output_quote_char+
+    #   (and their aliases +in_quote_char+ and +out_quote_char+)
+    #   specify the quote characters for parsing and generting.
+    # - Options +input_row_sep+ and +output_row_sep+
+    #   (and their aliases +in_row_sep+ and +out_row_sep+)
+    #   specify the row separators for parsing and generating.
+    #
+    # Example options (for column separators):
+    #
+    #   CSV.filter                                    # Default for both parsing and generating.
+    #   CSV.filter(in_col_sep: ';')                   # ';' for parsing, default for generating.
+    #   CSV.filter(out_col_sep: '|')                  # Default for parsing, '|' for generating.
+    #   CSV.filter(in_col_sep: ';', out_col_sep: '|') # ';' for parsing, '|' for generating.
+    #
+    # Note that for a special option (e.g., +input_col_sep+)
+    # and its corresponding "regular" option (e.g., +col_sep+),
+    # the two are mutually overriding.
+    #
+    # Another example (possibly surprising):
+    #
+    #   CSV.filter(in_col_sep: ';', col_sep: '|') # '|' for both parsing(!) and generating.
+    #
+    def filter(input=nil, output=nil, **options)
+      # parse options for input, output, or both
+      in_options, out_options = Hash.new, {row_sep: InputRecordSeparator.value}
+      options.each do |key, value|
+        case key
+        when /\Ain(?:put)?_(.+)\Z/
+          in_options[$1.to_sym] = value
+        when /\Aout(?:put)?_(.+)\Z/
+          out_options[$1.to_sym] = value
+        else
+          in_options[key]  = value
+          out_options[key] = value
+        end
+      end
+
+      # build input and output wrappers
+      input  = new(input  || ARGF, **in_options)
+      output = new(output || $stdout, **out_options)
+
+      # process headers
+      need_manual_header_output =
+        (in_options[:headers] and
+         out_options[:headers] == true and
+         out_options[:write_headers])
+      if need_manual_header_output
+        first_row = input.shift
+        if first_row
+          if first_row.is_a?(Row)
+            headers = first_row.headers
+            yield headers
+            output << headers
+          end
+          yield first_row
+          output << first_row
+        end
+      end
+
+      # read, yield, write
+      input.each do |row|
+        yield row
+        output << row
+      end
+    end
+
+    #
+    # :call-seq:
+    #   foreach(path_or_io, mode='r', **options) {|row| ... )
+    #   foreach(path_or_io, mode='r', **options) -> new_enumerator
+    #
+    # Calls the block with each row read from source +path_or_io+.
+    #
+    # \Path input without headers:
+    #
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   in_path = 't.csv'
+    #   File.write(in_path, string)
+    #   CSV.foreach(in_path) {|row| p row }
+    #
+    # Output:
+    #
+    #   ["foo", "0"]
+    #   ["bar", "1"]
+    #   ["baz", "2"]
+    #
+    # \Path input with headers:
+    #
+    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   in_path = 't.csv'
+    #   File.write(in_path, string)
+    #   CSV.foreach(in_path, headers: true) {|row| p row }
+    #
+    # Output:
+    #
+    #   <CSV::Row "Name":"foo" "Value":"0">
+    #   <CSV::Row "Name":"bar" "Value":"1">
+    #   <CSV::Row "Name":"baz" "Value":"2">
+    #
+    # \IO stream input without headers:
+    #
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   File.open('t.csv') do |in_io|
+    #     CSV.foreach(in_io) {|row| p row }
+    #   end
+    #
+    # Output:
+    #
+    #   ["foo", "0"]
+    #   ["bar", "1"]
+    #   ["baz", "2"]
+    #
+    # \IO stream input with headers:
+    #
+    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   File.open('t.csv') do |in_io|
+    #     CSV.foreach(in_io, headers: true) {|row| p row }
+    #   end
+    #
+    # Output:
+    #
+    #   <CSV::Row "Name":"foo" "Value":"0">
+    #   <CSV::Row "Name":"bar" "Value":"1">
+    #   <CSV::Row "Name":"baz" "Value":"2">
+    #
+    # With no block given, returns an \Enumerator:
+    #
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   CSV.foreach(path) # => #<Enumerator: CSV:foreach("t.csv", "r")>
+    #
+    # Arguments:
+    # * Argument +path_or_io+ must be a file path or an \IO stream.
+    # * Argument +mode+, if given, must be a \File mode.
+    #   See {Access Modes}[https://docs.ruby-lang.org/en/master/File.html#class-File-label-Access+Modes].
+    # * Arguments <tt>**options</tt> must be keyword options.
+    #   See {Options for Parsing}[#class-CSV-label-Options+for+Parsing].
+    # * This method optionally accepts an additional <tt>:encoding</tt> option
+    #   that you can use to specify the Encoding of the data read from +path+ or +io+.
+    #   You must provide this unless your data is in the encoding
+    #   given by <tt>Encoding::default_external</tt>.
+    #   Parsing will use this to determine how to parse the data.
+    #   You may provide a second Encoding to
+    #   have the data transcoded as it is read. For example,
+    #     encoding: 'UTF-32BE:UTF-8'
+    #   would read +UTF-32BE+ data from the file
+    #   but transcode it to +UTF-8+ before parsing.
+    def foreach(path, mode="r", **options, &block)
+      return to_enum(__method__, path, mode, **options) unless block_given?
+      open(path, mode, **options) do |csv|
+        csv.each(&block)
+      end
+    end
+
+    #
+    # :call-seq:
+    #   generate(csv_string, **options) {|csv| ... }
+    #   generate(**options) {|csv| ... }
+    #
+    # * Argument +csv_string+, if given, must be a \String object;
+    #   defaults to a new empty \String.
+    # * Arguments +options+, if given, should be generating options.
+    #   See {Options for Generating}[#class-CSV-label-Options+for+Generating].
+    #
+    # ---
+    #
+    # Creates a new \CSV object via <tt>CSV.new(csv_string, **options)</tt>;
+    # calls the block with the \CSV object, which the block may modify;
+    # returns the \String generated from the \CSV object.
+    #
+    # Note that a passed \String *is* modified by this method.
+    # Pass <tt>csv_string</tt>.dup if the \String must be preserved.
+    #
+    # This method has one additional option: <tt>:encoding</tt>,
+    # which sets the base Encoding for the output if no no +str+ is specified.
+    # CSV needs this hint if you plan to output non-ASCII compatible data.
+    #
+    # ---
+    #
+    # Add lines:
+    #   input_string = "foo,0\nbar,1\nbaz,2\n"
+    #   output_string = CSV.generate(input_string) do |csv|
+    #     csv << ['bat', 3]
+    #     csv << ['bam', 4]
+    #   end
+    #   output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
+    #   input_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
+    #   output_string.equal?(input_string) # => true # Same string, modified
+    #
+    # Add lines into new string, preserving old string:
+    #   input_string = "foo,0\nbar,1\nbaz,2\n"
+    #   output_string = CSV.generate(input_string.dup) do |csv|
+    #     csv << ['bat', 3]
+    #     csv << ['bam', 4]
+    #   end
+    #   output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
+    #   input_string # => "foo,0\nbar,1\nbaz,2\n"
+    #   output_string.equal?(input_string) # => false # Different strings
+    #
+    # Create lines from nothing:
+    #   output_string = CSV.generate do |csv|
+    #     csv << ['foo', 0]
+    #     csv << ['bar', 1]
+    #     csv << ['baz', 2]
+    #   end
+    #   output_string # => "foo,0\nbar,1\nbaz,2\n"
+    #
+    # ---
+    #
+    # Raises an exception if +csv_string+ is not a \String object:
+    #   # Raises TypeError (no implicit conversion of Integer into String)
+    #   CSV.generate(0)
+    #
+    def generate(str=nil, **options)
+      encoding = options[:encoding]
+      # add a default empty String, if none was given
+      if str
+        str = StringIO.new(str)
+        str.seek(0, IO::SEEK_END)
+        str.set_encoding(encoding) if encoding
+      else
+        str = +""
+        str.force_encoding(encoding) if encoding
+      end
+      csv = new(str, **options) # wrap
+      yield csv         # yield for appending
+      csv.string        # return final String
+    end
+
+    # :call-seq:
+    #   CSV.generate_line(ary)
+    #   CSV.generate_line(ary, **options)
+    #
+    # Returns the \String created by generating \CSV from +ary+
+    # using the specified +options+.
+    #
+    # Argument +ary+ must be an \Array.
+    #
+    # Special options:
+    # * Option <tt>:row_sep</tt> defaults to <tt>"\n"> on Ruby 3.0 or later
+    #   and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
+    #     $INPUT_RECORD_SEPARATOR # => "\n"
+    # * This method accepts an additional option, <tt>:encoding</tt>, which sets the base
+    #   Encoding for the output. This method will try to guess your Encoding from
+    #   the first non-+nil+ field in +row+, if possible, but you may need to use
+    #   this parameter as a backup plan.
+    #
+    # For other +options+,
+    # see {Options for Generating}[#class-CSV-label-Options+for+Generating].
+    #
+    # ---
+    #
+    # Returns the \String generated from an \Array:
+    #   CSV.generate_line(['foo', '0']) # => "foo,0\n"
+    #
+    # ---
+    #
+    # Raises an exception if +ary+ is not an \Array:
+    #   # Raises NoMethodError (undefined method `find' for :foo:Symbol)
+    #   CSV.generate_line(:foo)
+    #
+    def generate_line(row, **options)
+      options = {row_sep: InputRecordSeparator.value}.merge(options)
+      str = +""
+      if options[:encoding]
+        str.force_encoding(options[:encoding])
+      else
+        fallback_encoding = nil
+        output_encoding = nil
+        row.each do |field|
+          next unless field.is_a?(String)
+          fallback_encoding ||= field.encoding
+          next if field.ascii_only?
+          output_encoding = field.encoding
+          break
+        end
+        output_encoding ||= fallback_encoding
+        if output_encoding
+          str.force_encoding(output_encoding)
+        end
+      end
+      (new(str, **options) << row).string
+    end
+
+    # :call-seq:
+    #   CSV.generate_lines(rows)
+    #   CSV.generate_lines(rows, **options)
+    #
+    # Returns the \String created by generating \CSV from
+    # using the specified +options+.
+    #
+    # Argument +rows+ must be an \Array of row. Row is \Array of \String or \CSV::Row.
+    #
+    # Special options:
+    # * Option <tt>:row_sep</tt> defaults to <tt>"\n"</tt> on Ruby 3.0 or later
+    #   and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
+    #     $INPUT_RECORD_SEPARATOR # => "\n"
+    # * This method accepts an additional option, <tt>:encoding</tt>, which sets the base
+    #   Encoding for the output. This method will try to guess your Encoding from
+    #   the first non-+nil+ field in +row+, if possible, but you may need to use
+    #   this parameter as a backup plan.
+    #
+    # For other +options+,
+    # see {Options for Generating}[#class-CSV-label-Options+for+Generating].
+    #
+    # ---
+    #
+    # Returns the \String generated from an
+    #   CSV.generate_lines([['foo', '0'], ['bar', '1'], ['baz', '2']]) # => "foo,0\nbar,1\nbaz,2\n"
+    #
+    # ---
+    #
+    # Raises an exception
+    #   # Raises NoMethodError (undefined method `each' for :foo:Symbol)
+    #   CSV.generate_lines(:foo)
+    #
+    def generate_lines(rows, **options)
+      self.generate(**options) do |csv|
+        rows.each do |row|
+          csv << row
+        end
+      end
+    end
+
+    #
+    # :call-seq:
+    #   open(path_or_io, mode = "rb", **options ) -> new_csv
+    #   open(path_or_io, mode = "rb", **options ) { |csv| ... } -> object
+    #
+    # possible options elements:
+    #   keyword form:
+    #     :invalid => nil      # raise error on invalid byte sequence (default)
+    #     :invalid => :replace # replace invalid byte sequence
+    #     :undef => :replace   # replace undefined conversion
+    #     :replace => string   # replacement string ("?" or "\uFFFD" if not specified)
+    #
+    # * Argument +path_or_io+, must be a file path or an \IO stream.
+    # :include: ../doc/csv/arguments/io.rdoc
+    # * Argument +mode+, if given, must be a \File mode.
+    #   See {Access Modes}[https://docs.ruby-lang.org/en/master/File.html#class-File-label-Access+Modes].
+    # * Arguments <tt>**options</tt> must be keyword options.
+    #   See {Options for Generating}[#class-CSV-label-Options+for+Generating].
+    # * This method optionally accepts an additional <tt>:encoding</tt> option
+    #   that you can use to specify the Encoding of the data read from +path+ or +io+.
+    #   You must provide this unless your data is in the encoding
+    #   given by <tt>Encoding::default_external</tt>.
+    #   Parsing will use this to determine how to parse the data.
+    #   You may provide a second Encoding to
+    #   have the data transcoded as it is read. For example,
+    #     encoding: 'UTF-32BE:UTF-8'
+    #   would read +UTF-32BE+ data from the file
+    #   but transcode it to +UTF-8+ before parsing.
+    #
+    # ---
+    #
+    # These examples assume prior execution of:
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #
+    #   string_io = StringIO.new
+    #   string_io << "foo,0\nbar,1\nbaz,2\n"
+    #
+    # ---
+    #
+    # With no block given, returns a new \CSV object.
+    #
+    # Create a \CSV object using a file path:
+    #   csv = CSV.open(path)
+    #   csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    #
+    # Create a \CSV object using an open \File:
+    #   csv = CSV.open(File.open(path))
+    #   csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    #
+    # Create a \CSV object using a \StringIO:
+    #   csv = CSV.open(string_io)
+    #   csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    # ---
+    #
+    # With a block given, calls the block with the created \CSV object;
+    # returns the block's return value:
+    #
+    # Using a file path:
+    #   csv = CSV.open(path) {|csv| p csv}
+    #   csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    # Output:
+    #   #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    #
+    # Using an open \File:
+    #   csv = CSV.open(File.open(path)) {|csv| p csv}
+    #   csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    # Output:
+    #   #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    #
+    # Using a \StringIO:
+    #   csv = CSV.open(string_io) {|csv| p csv}
+    #   csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    # Output:
+    #   #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+    # ---
+    #
+    # Raises an exception if the argument is not a \String object or \IO object:
+    #   # Raises TypeError (no implicit conversion of Symbol into String)
+    #   CSV.open(:foo)
+    def open(filename_or_io, mode="r", **options)
+      # wrap a File opened with the remaining +args+ with no newline
+      # decorator
+      file_opts = {}
+      may_enable_bom_detection_automatically(filename_or_io,
+                                             mode,
+                                             options,
+                                             file_opts)
+      file_opts.merge!(options)
+      unless file_opts.key?(:newline)
+        file_opts[:universal_newline] ||= false
+      end
+      options.delete(:invalid)
+      options.delete(:undef)
+      options.delete(:replace)
+      options.delete_if {|k, _| /newline\z/.match?(k)}
+
+      if filename_or_io.is_a?(StringIO)
+        f = create_stringio(filename_or_io.string, mode, **file_opts)
+      else
+        begin
+          f = File.open(filename_or_io, mode, **file_opts)
+        rescue ArgumentError => e
+          raise unless /needs binmode/.match?(e.message) and mode == "r"
+          mode = "rb"
+          file_opts = {encoding: Encoding.default_external}.merge(file_opts)
+          retry
+        end
+      end
+
+      begin
+        csv = new(f, **options)
+      rescue Exception
+        f.close
+        raise
+      end
+
+      # handle blocks like Ruby's open(), not like the CSV library
+      if block_given?
+        begin
+          yield csv
+        ensure
+          csv.close
+        end
+      else
+        csv
+      end
+    end
+
+    #
+    # :call-seq:
+    #   parse(string) -> array_of_arrays
+    #   parse(io) -> array_of_arrays
+    #   parse(string, headers: ..., **options) -> csv_table
+    #   parse(io, headers: ..., **options) -> csv_table
+    #   parse(string, **options) {|row| ... }
+    #   parse(io, **options) {|row| ... }
+    #
+    # Parses +string+ or +io+ using the specified +options+.
+    #
+    # - Argument +string+ should be a \String object;
+    #   it will be put into a new StringIO object positioned at the beginning.
+    # :include: ../doc/csv/arguments/io.rdoc
+    # - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
+    #
+    # ====== Without Option +headers+
+    #
+    # Without {option +headers+}[#class-CSV-label-Option+headers] case.
+    #
+    # These examples assume prior execution of:
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #
+    # ---
+    #
+    # With no block given, returns an \Array of Arrays formed from the source.
+    #
+    # Parse a \String:
+    #   a_of_a = CSV.parse(string)
+    #   a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # Parse an open \File:
+    #   a_of_a = File.open(path) do |file|
+    #     CSV.parse(file)
+    #   end
+    #   a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # ---
+    #
+    # With a block given, calls the block with each parsed row:
+    #
+    # Parse a \String:
+    #   CSV.parse(string) {|row| p row }
+    #
+    # Output:
+    #   ["foo", "0"]
+    #   ["bar", "1"]
+    #   ["baz", "2"]
+    #
+    # Parse an open \File:
+    #   File.open(path) do |file|
+    #     CSV.parse(file) {|row| p row }
+    #   end
+    #
+    # Output:
+    #   ["foo", "0"]
+    #   ["bar", "1"]
+    #   ["baz", "2"]
+    #
+    # ====== With Option +headers+
+    #
+    # With {option +headers+}[#class-CSV-label-Option+headers] case.
+    #
+    # These examples assume prior execution of:
+    #   string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #
+    # ---
+    #
+    # With no block given, returns a CSV::Table object formed from the source.
+    #
+    # Parse a \String:
+    #   csv_table = CSV.parse(string, headers: ['Name', 'Count'])
+    #   csv_table # => #<CSV::Table mode:col_or_row row_count:5>
+    #
+    # Parse an open \File:
+    #   csv_table = File.open(path) do |file|
+    #     CSV.parse(file, headers: ['Name', 'Count'])
+    #   end
+    #   csv_table # => #<CSV::Table mode:col_or_row row_count:4>
+    #
+    # ---
+    #
+    # With a block given, calls the block with each parsed row,
+    # which has been formed into a CSV::Row object:
+    #
+    # Parse a \String:
+    #   CSV.parse(string, headers: ['Name', 'Count']) {|row| p row }
+    #
+    # Output:
+    #   # <CSV::Row "Name":"foo" "Count":"0">
+    #   # <CSV::Row "Name":"bar" "Count":"1">
+    #   # <CSV::Row "Name":"baz" "Count":"2">
+    #
+    # Parse an open \File:
+    #   File.open(path) do |file|
+    #     CSV.parse(file, headers: ['Name', 'Count']) {|row| p row }
+    #   end
+    #
+    # Output:
+    #   # <CSV::Row "Name":"foo" "Count":"0">
+    #   # <CSV::Row "Name":"bar" "Count":"1">
+    #   # <CSV::Row "Name":"baz" "Count":"2">
+    #
+    # ---
+    #
+    # Raises an exception if the argument is not a \String object or \IO object:
+    #   # Raises NoMethodError (undefined method `close' for :foo:Symbol)
+    #   CSV.parse(:foo)
+    #
+    # ---
+    #
+    # Please make sure if your text contains \BOM or not. CSV.parse will not remove
+    # \BOM automatically. You might want to remove \BOM before calling CSV.parse :
+    #   # remove BOM on calling File.open
+    #   File.open(path, encoding: 'bom|utf-8') do |file|
+    #     CSV.parse(file, headers: true) do |row|
+    #       # you can get value by column name because BOM is removed
+    #       p row['Name']
+    #     end
+    #   end
+    #
+    # Output:
+    #   # "foo"
+    #   # "bar"
+    #   # "baz"
+    def parse(str, **options, &block)
+      csv = new(str, **options)
+
+      return csv.each(&block) if block_given?
+
+      # slurp contents, if no block is given
+      begin
+        csv.read
+      ensure
+        csv.close
+      end
+    end
+
+    # :call-seq:
+    #   CSV.parse_line(string) -> new_array or nil
+    #   CSV.parse_line(io) -> new_array or nil
+    #   CSV.parse_line(string, **options) -> new_array or nil
+    #   CSV.parse_line(io, **options) -> new_array or nil
+    #   CSV.parse_line(string, headers: true, **options) -> csv_row or nil
+    #   CSV.parse_line(io, headers: true, **options) -> csv_row or nil
+    #
+    # Returns the data created by parsing the first line of +string+ or +io+
+    # using the specified +options+.
+    #
+    # - Argument +string+ should be a \String object;
+    #   it will be put into a new StringIO object positioned at the beginning.
+    # :include: ../doc/csv/arguments/io.rdoc
+    # - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
+    #
+    # ====== Without Option +headers+
+    #
+    # Without option +headers+, returns the first row as a new \Array.
+    #
+    # These examples assume prior execution of:
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #
+    # Parse the first line from a \String object:
+    #   CSV.parse_line(string) # => ["foo", "0"]
+    #
+    # Parse the first line from a File object:
+    #   File.open(path) do |file|
+    #     CSV.parse_line(file) # => ["foo", "0"]
+    #   end # => ["foo", "0"]
+    #
+    # Returns +nil+ if the argument is an empty \String:
+    #   CSV.parse_line('') # => nil
+    #
+    # ====== With Option +headers+
+    #
+    # With {option +headers+}[#class-CSV-label-Option+headers],
+    # returns the first row as a CSV::Row object.
+    #
+    # These examples assume prior execution of:
+    #   string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #
+    # Parse the first line from a \String object:
+    #   CSV.parse_line(string, headers: true) # => #<CSV::Row "Name":"foo" "Count":"0">
+    #
+    # Parse the first line from a File object:
+    #   File.open(path) do |file|
+    #     CSV.parse_line(file, headers: true)
+    #   end # => #<CSV::Row "Name":"foo" "Count":"0">
+    #
+    # ---
+    #
+    # Raises an exception if the argument is +nil+:
+    #   # Raises ArgumentError (Cannot parse nil as CSV):
+    #   CSV.parse_line(nil)
+    #
+    def parse_line(line, **options)
+      new(line, **options).each.first
+    end
+
+    #
+    # :call-seq:
+    #   read(source, **options) -> array_of_arrays
+    #   read(source, headers: true, **options) -> csv_table
+    #
+    # Opens the given +source+ with the given +options+ (see CSV.open),
+    # reads the source (see CSV#read), and returns the result,
+    # which will be either an \Array of Arrays or a CSV::Table.
+    #
+    # Without headers:
+    #   string = "foo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # With headers:
+    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   CSV.read(path, headers: true) # => #<CSV::Table mode:col_or_row row_count:4>
+    def read(path, **options)
+      open(path, **options) { |csv| csv.read }
+    end
+
+    # :call-seq:
+    #   CSV.readlines(source, **options)
+    #
+    # Alias for CSV.read.
+    def readlines(path, **options)
+      read(path, **options)
+    end
+
+    # :call-seq:
+    #   CSV.table(source, **options)
+    #
+    # Calls CSV.read with +source+, +options+, and certain default options:
+    # - +headers+: +true+
+    # - +converters+: +:numeric+
+    # - +header_converters+: +:symbol+
+    #
+    # Returns a CSV::Table object.
+    #
+    # Example:
+    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   path = 't.csv'
+    #   File.write(path, string)
+    #   CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:4>
+    def table(path, **options)
+      default_options = {
+        headers:           true,
+        converters:        :numeric,
+        header_converters: :symbol,
+      }
+      options = default_options.merge(options)
+      read(path, **options)
+    end
+
+    ON_WINDOWS = /mingw|mswin/.match?(RUBY_PLATFORM)
+    private_constant :ON_WINDOWS
+
+    private
+    def may_enable_bom_detection_automatically(filename_or_io,
+                                               mode,
+                                               options,
+                                               file_opts)
+      if filename_or_io.is_a?(StringIO)
+        # Support to StringIO was dropped for Ruby 2.6 and earlier without BOM support:
+        # https://github.com/ruby/stringio/pull/47
+        return if RUBY_VERSION < "2.7"
+      else
+        # "bom|utf-8" may be buggy on Windows:
+        # https://bugs.ruby-lang.org/issues/20526
+        return if ON_WINDOWS
+      end
+      return unless Encoding.default_external == Encoding::UTF_8
+      return if options.key?(:encoding)
+      return if options.key?(:external_encoding)
+      return if mode.is_a?(String) and mode.include?(":")
+      file_opts[:encoding] = "bom|utf-8"
+    end
+
+    if RUBY_VERSION < "2.7"
+      def create_stringio(str, mode, opts)
+        opts.delete_if {|k, _| k == :universal_newline or DEFAULT_OPTIONS.key?(k)}
+        raise ArgumentError, "Unsupported options parsing StringIO: #{opts.keys}" unless opts.empty?
+        StringIO.new(str, mode)
+      end
+    else
+      def create_stringio(str, mode, opts)
+        StringIO.new(str, mode, **opts)
+      end
+    end
+  end
+
+  # :call-seq:
+  #   CSV.new(string)
+  #   CSV.new(io)
+  #   CSV.new(string, **options)
+  #   CSV.new(io, **options)
+  #
+  # Returns the new \CSV object created using +string+ or +io+
+  # and the specified +options+.
+  #
+  # - Argument +string+ should be a \String object;
+  #   it will be put into a new StringIO object positioned at the beginning.
+  # :include: ../doc/csv/arguments/io.rdoc
+  # - Argument +options+: See:
+  #   * {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
+  #   * {Options for Generating}[#class-CSV-label-Options+for+Generating]
+  #   For performance reasons, the options cannot be overridden
+  #   in a \CSV object, so those specified here will endure.
+  #
+  # In addition to the \CSV instance methods, several \IO methods are delegated.
+  # See {Delegated Methods}[#class-CSV-label-Delegated+Methods].
+  #
+  # ---
+  #
+  # Create a \CSV object from a \String object:
+  #   csv = CSV.new('foo,0')
+  #   csv # => #<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+  #
+  # Create a \CSV object from a \File object:
+  #   File.write('t.csv', 'foo,0')
+  #   csv = CSV.new(File.open('t.csv'))
+  #   csv # => #<CSV io_type:File io_path:"t.csv" encoding:UTF-8 lineno:0 col_sep:"," row_sep:"\n" quote_char:"\"">
+  #
+  # ---
+  #
+  # Raises an exception if the argument is +nil+:
+  #   # Raises ArgumentError (Cannot parse nil as CSV):
+  #   CSV.new(nil)
+  #
+  def initialize(data,
+                 col_sep: ",",
+                 row_sep: :auto,
+                 quote_char: '"',
+                 field_size_limit: nil,
+                 max_field_size: nil,
+                 converters: nil,
+                 unconverted_fields: nil,
+                 headers: false,
+                 return_headers: false,
+                 write_headers: nil,
+                 header_converters: nil,
+                 skip_blanks: false,
+                 force_quotes: false,
+                 skip_lines: nil,
+                 liberal_parsing: false,
+                 internal_encoding: nil,
+                 external_encoding: nil,
+                 encoding: nil,
+                 nil_value: nil,
+                 empty_value: "",
+                 strip: false,
+                 quote_empty: true,
+                 write_converters: nil,
+                 write_nil_value: nil,
+                 write_empty_value: "")
+    raise ArgumentError.new("Cannot parse nil as CSV") if data.nil?
+
+    if data.is_a?(String)
+      if encoding
+        if encoding.is_a?(String)
+          data_external_encoding, data_internal_encoding = encoding.split(":", 2)
+          if data_internal_encoding
+            data = data.encode(data_internal_encoding, data_external_encoding)
+          else
+            data = data.dup.force_encoding(data_external_encoding)
+          end
+        else
+          data = data.dup.force_encoding(encoding)
+        end
+      end
+      @io = StringIO.new(data)
+    else
+      @io = data
+    end
+    @encoding = determine_encoding(encoding, internal_encoding)
+
+    @base_fields_converter_options = {
+      nil_value: nil_value,
+      empty_value: empty_value,
+    }
+    @write_fields_converter_options = {
+      nil_value: write_nil_value,
+      empty_value: write_empty_value,
+    }
+    @initial_converters = converters
+    @initial_header_converters = header_converters
+    @initial_write_converters = write_converters
+
+    if max_field_size.nil? and field_size_limit
+      max_field_size = field_size_limit - 1
+    end
+    @parser_options = {
+      column_separator: col_sep,
+      row_separator: row_sep,
+      quote_character: quote_char,
+      max_field_size: max_field_size,
+      unconverted_fields: unconverted_fields,
+      headers: headers,
+      return_headers: return_headers,
+      skip_blanks: skip_blanks,
+      skip_lines: skip_lines,
+      liberal_parsing: liberal_parsing,
+      encoding: @encoding,
+      nil_value: nil_value,
+      empty_value: empty_value,
+      strip: strip,
+    }
+    @parser = nil
+    @parser_enumerator = nil
+    @eof_error = nil
+
+    @writer_options = {
+      encoding: @encoding,
+      force_encoding: (not encoding.nil?),
+      force_quotes: force_quotes,
+      headers: headers,
+      write_headers: write_headers,
+      column_separator: col_sep,
+      row_separator: row_sep,
+      quote_character: quote_char,
+      quote_empty: quote_empty,
+    }
+
+    @writer = nil
+    writer if @writer_options[:write_headers]
+  end
+
+  class TSV < CSV
+    def initialize(data, **options)
+      super(data, **({col_sep: "\t"}.merge(options)))
+    end
+  end
+
+  # :call-seq:
+  #   csv.col_sep -> string
+  #
+  # Returns the encoded column separator; used for parsing and writing;
+  # see {Option +col_sep+}[#class-CSV-label-Option+col_sep]:
+  #   CSV.new('').col_sep # => ","
+  def col_sep
+    parser.column_separator
+  end
+
+  # :call-seq:
+  #   csv.row_sep -> string
+  #
+  # Returns the encoded row separator; used for parsing and writing;
+  # see {Option +row_sep+}[#class-CSV-label-Option+row_sep]:
+  #   CSV.new('').row_sep # => "\n"
+  def row_sep
+    parser.row_separator
+  end
+
+  # :call-seq:
+  #   csv.quote_char -> character
+  #
+  # Returns the encoded quote character; used for parsing and writing;
+  # see {Option +quote_char+}[#class-CSV-label-Option+quote_char]:
+  #   CSV.new('').quote_char # => "\""
+  def quote_char
+    parser.quote_character
+  end
+
+  # :call-seq:
+  #   csv.field_size_limit -> integer or nil
+  #
+  # Returns the limit for field size; used for parsing;
+  # see {Option +field_size_limit+}[#class-CSV-label-Option+field_size_limit]:
+  #   CSV.new('').field_size_limit # => nil
+  #
+  # Deprecated since 3.2.3. Use +max_field_size+ instead.
+  def field_size_limit
+    parser.field_size_limit
+  end
+
+  # :call-seq:
+  #   csv.max_field_size -> integer or nil
+  #
+  # Returns the limit for field size; used for parsing;
+  # see {Option +max_field_size+}[#class-CSV-label-Option+max_field_size]:
+  #   CSV.new('').max_field_size # => nil
+  #
+  # Since 3.2.3.
+  def max_field_size
+    parser.max_field_size
+  end
+
+  # :call-seq:
+  #   csv.skip_lines -> regexp or nil
+  #
+  # Returns the \Regexp used to identify comment lines; used for parsing;
+  # see {Option +skip_lines+}[#class-CSV-label-Option+skip_lines]:
+  #   CSV.new('').skip_lines # => nil
+  def skip_lines
+    parser.skip_lines
+  end
+
+  # :call-seq:
+  #   csv.converters -> array
+  #
+  # Returns an \Array containing field converters;
+  # see {Field Converters}[#class-CSV-label-Field+Converters]:
+  #   csv = CSV.new('')
+  #   csv.converters # => []
+  #   csv.convert(:integer)
+  #   csv.converters # => [:integer]
+  #   csv.convert(proc {|x| x.to_s })
+  #   csv.converters
+  #
+  # Notes that you need to call
+  # +Ractor.make_shareable(CSV::Converters)+ on the main Ractor to use
+  # this method.
+  def converters
+    parser_fields_converter.map do |converter|
+      name = Converters.rassoc(converter)
+      name ? name.first : converter
+    end
+  end
+
+  # :call-seq:
+  #   csv.unconverted_fields? -> object
+  #
+  # Returns the value that determines whether unconverted fields are to be
+  # available; used for parsing;
+  # see {Option +unconverted_fields+}[#class-CSV-label-Option+unconverted_fields]:
+  #   CSV.new('').unconverted_fields? # => nil
+  def unconverted_fields?
+    parser.unconverted_fields?
+  end
+
+  # :call-seq:
+  #   csv.headers -> object
+  #
+  # Returns the value that determines whether headers are used; used for parsing;
+  # see {Option +headers+}[#class-CSV-label-Option+headers]:
+  #   CSV.new('').headers # => nil
+  def headers
+    if @writer
+      @writer.headers
+    else
+      parsed_headers = parser.headers
+      return parsed_headers if parsed_headers
+      raw_headers = @parser_options[:headers]
+      raw_headers = nil if raw_headers == false
+      raw_headers
+    end
+  end
+
+  # :call-seq:
+  #   csv.return_headers? -> true or false
+  #
+  # Returns the value that determines whether headers are to be returned; used for parsing;
+  # see {Option +return_headers+}[#class-CSV-label-Option+return_headers]:
+  #   CSV.new('').return_headers? # => false
+  def return_headers?
+    parser.return_headers?
+  end
+
+  # :call-seq:
+  #   csv.write_headers? -> true or false
+  #
+  # Returns the value that determines whether headers are to be written; used for generating;
+  # see {Option +write_headers+}[#class-CSV-label-Option+write_headers]:
+  #   CSV.new('').write_headers? # => nil
+  def write_headers?
+    @writer_options[:write_headers]
+  end
+
+  # :call-seq:
+  #   csv.header_converters -> array
+  #
+  # Returns an \Array containing header converters; used for parsing;
+  # see {Header Converters}[#class-CSV-label-Header+Converters]:
+  #   CSV.new('').header_converters # => []
+  #
+  # Notes that you need to call
+  # +Ractor.make_shareable(CSV::HeaderConverters)+ on the main Ractor
+  # to use this method.
+  def header_converters
+    header_fields_converter.map do |converter|
+      name = HeaderConverters.rassoc(converter)
+      name ? name.first : converter
+    end
+  end
+
+  # :call-seq:
+  #   csv.skip_blanks? -> true or false
+  #
+  # Returns the value that determines whether blank lines are to be ignored; used for parsing;
+  # see {Option +skip_blanks+}[#class-CSV-label-Option+skip_blanks]:
+  #   CSV.new('').skip_blanks? # => false
+  def skip_blanks?
+    parser.skip_blanks?
+  end
+
+  # :call-seq:
+  #   csv.force_quotes? -> true or false
+  #
+  # Returns the value that determines whether all output fields are to be quoted;
+  # used for generating;
+  # see {Option +force_quotes+}[#class-CSV-label-Option+force_quotes]:
+  #   CSV.new('').force_quotes? # => false
+  def force_quotes?
+    @writer_options[:force_quotes]
+  end
+
+  # :call-seq:
+  #   csv.liberal_parsing? -> true or false
+  #
+  # Returns the value that determines whether illegal input is to be handled; used for parsing;
+  # see {Option +liberal_parsing+}[#class-CSV-label-Option+liberal_parsing]:
+  #   CSV.new('').liberal_parsing? # => false
+  def liberal_parsing?
+    parser.liberal_parsing?
+  end
+
+  # :call-seq:
+  #   csv.encoding -> encoding
+  #
+  # Returns the encoding used for parsing and generating;
+  # see {Character Encodings (M17n or Multilingualization)}[#class-CSV-label-Character+Encodings+-28M17n+or+Multilingualization-29]:
+  #   CSV.new('').encoding # => #<Encoding:UTF-8>
+  attr_reader :encoding
+
+  # :call-seq:
+  #   csv.line_no -> integer
+  #
+  # Returns the count of the rows parsed or generated.
+  #
+  # Parsing:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #   CSV.open(path) do |csv|
+  #     csv.each do |row|
+  #       p [csv.lineno, row]
+  #     end
+  #   end
+  # Output:
+  #   [1, ["foo", "0"]]
+  #   [2, ["bar", "1"]]
+  #   [3, ["baz", "2"]]
+  #
+  # Generating:
+  #   CSV.generate do |csv|
+  #     p csv.lineno; csv << ['foo', 0]
+  #     p csv.lineno; csv << ['bar', 1]
+  #     p csv.lineno; csv << ['baz', 2]
+  #   end
+  # Output:
+  #   0
+  #   1
+  #   2
+  def lineno
+    if @writer
+      @writer.lineno
+    else
+      parser.lineno
+    end
+  end
+
+  # :call-seq:
+  #   csv.line -> array
+  #
+  # Returns the line most recently read:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #   CSV.open(path) do |csv|
+  #     csv.each do |row|
+  #       p [csv.lineno, csv.line]
+  #     end
+  #   end
+  # Output:
+  #   [1, "foo,0\n"]
+  #   [2, "bar,1\n"]
+  #   [3, "baz,2\n"]
+  def line
+    parser.line
+  end
+
+  ### IO and StringIO Delegation ###
+
+  extend Forwardable
+  def_delegators :@io, :binmode, :close, :close_read, :close_write,
+                       :closed?, :external_encoding, :fcntl,
+                       :fileno, :flush, :fsync, :internal_encoding,
+                       :isatty, :pid, :pos, :pos=, :reopen,
+                       :seek, :string, :sync, :sync=, :tell,
+                       :truncate, :tty?
+
+  def binmode?
+    if @io.respond_to?(:binmode?)
+      @io.binmode?
+    else
+      false
+    end
+  end
+
+  def flock(*args)
+    raise NotImplementedError unless @io.respond_to?(:flock)
+    @io.flock(*args)
+  end
+
+  def ioctl(*args)
+    raise NotImplementedError unless @io.respond_to?(:ioctl)
+    @io.ioctl(*args)
+  end
+
+  def path
+    @io.path if @io.respond_to?(:path)
+  end
+
+  def stat(*args)
+    raise NotImplementedError unless @io.respond_to?(:stat)
+    @io.stat(*args)
+  end
+
+  def to_i
+    raise NotImplementedError unless @io.respond_to?(:to_i)
+    @io.to_i
+  end
+
+  def to_io
+    @io.respond_to?(:to_io) ? @io.to_io : @io
+  end
+
+  def eof?
+    return false if @eof_error
+    begin
+      parser_enumerator.peek
+      false
+    rescue MalformedCSVError => error
+      @eof_error = error
+      false
+    rescue StopIteration
+      true
+    end
+  end
+  alias_method :eof, :eof?
+
+  # Rewinds the underlying IO object and resets CSV's lineno() counter.
+  def rewind
+    @parser = nil
+    @parser_enumerator = nil
+    @eof_error = nil
+    @writer.rewind if @writer
+    @io.rewind
+  end
+
+  ### End Delegation ###
+
+  # :call-seq:
+  #   csv << row -> self
+  #
+  # Appends a row to +self+.
+  #
+  # - Argument +row+ must be an \Array object or a CSV::Row object.
+  # - The output stream must be open for writing.
+  #
+  # ---
+  #
+  # Append Arrays:
+  #   CSV.generate do |csv|
+  #     csv << ['foo', 0]
+  #     csv << ['bar', 1]
+  #     csv << ['baz', 2]
+  #   end # => "foo,0\nbar,1\nbaz,2\n"
+  #
+  # Append CSV::Rows:
+  #   headers = []
+  #   CSV.generate do |csv|
+  #     csv << CSV::Row.new(headers, ['foo', 0])
+  #     csv << CSV::Row.new(headers, ['bar', 1])
+  #     csv << CSV::Row.new(headers, ['baz', 2])
+  #   end # => "foo,0\nbar,1\nbaz,2\n"
+  #
+  # Headers in CSV::Row objects are not appended:
+  #   headers = ['Name', 'Count']
+  #   CSV.generate do |csv|
+  #     csv << CSV::Row.new(headers, ['foo', 0])
+  #     csv << CSV::Row.new(headers, ['bar', 1])
+  #     csv << CSV::Row.new(headers, ['baz', 2])
+  #   end # => "foo,0\nbar,1\nbaz,2\n"
+  #
+  # ---
+  #
+  # Raises an exception if +row+ is not an \Array or \CSV::Row:
+  #   CSV.generate do |csv|
+  #     # Raises NoMethodError (undefined method `collect' for :foo:Symbol)
+  #     csv << :foo
+  #   end
+  #
+  # Raises an exception if the output stream is not opened for writing:
+  #   path = 't.csv'
+  #   File.write(path, '')
+  #   File.open(path) do |file|
+  #     CSV.open(file) do |csv|
+  #       # Raises IOError (not opened for writing)
+  #       csv << ['foo', 0]
+  #     end
+  #   end
+  def <<(row)
+    writer << row
+    self
+  end
+  alias_method :add_row, :<<
+  alias_method :puts,    :<<
+
+  # :call-seq:
+  #   convert(converter_name) -> array_of_procs
+  #   convert {|field, field_info| ... } -> array_of_procs
+  #
+  # - With no block, installs a field converter (a \Proc).
+  # - With a block, defines and installs a custom field converter.
+  # - Returns the \Array of installed field converters.
+  #
+  # - Argument +converter_name+, if given, should be the name
+  #   of an existing field converter.
+  #
+  # See {Field Converters}[#class-CSV-label-Field+Converters].
+  # ---
+  #
+  # With no block, installs a field converter:
+  #   csv = CSV.new('')
+  #   csv.convert(:integer)
+  #   csv.convert(:float)
+  #   csv.convert(:date)
+  #   csv.converters # => [:integer, :float, :date]
+  #
+  # ---
+  #
+  # The block, if given, is called for each field:
+  # - Argument +field+ is the field value.
+  # - Argument +field_info+ is a CSV::FieldInfo object
+  #   containing details about the field.
+  #
+  # The examples here assume the prior execution of:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #
+  # Example giving a block:
+  #   csv = CSV.open(path)
+  #   csv.convert {|field, field_info| p [field, field_info]; field.upcase }
+  #   csv.read # => [["FOO", "0"], ["BAR", "1"], ["BAZ", "2"]]
+  #
+  # Output:
+  #   ["foo", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
+  #   ["0", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
+  #   ["bar", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
+  #   ["1", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
+  #   ["baz", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
+  #   ["2", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
+  #
+  # The block need not return a \String object:
+  #   csv = CSV.open(path)
+  #   csv.convert {|field, field_info| field.to_sym }
+  #   csv.read # => [[:foo, :"0"], [:bar, :"1"], [:baz, :"2"]]
+  #
+  # If +converter_name+ is given, the block is not called:
+  #   csv = CSV.open(path)
+  #   csv.convert(:integer) {|field, field_info| fail 'Cannot happen' }
+  #   csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
+  #
+  # ---
+  #
+  # Raises a parse-time exception if +converter_name+ is not the name of a built-in
+  # field converter:
+  #   csv = CSV.open(path)
+  #   csv.convert(:nosuch) => [nil]
+  #   # Raises NoMethodError (undefined method `arity' for nil:NilClass)
+  #   csv.read
+  def convert(name = nil, &converter)
+    parser_fields_converter.add_converter(name, &converter)
+  end
+
+  # :call-seq:
+  #   header_convert(converter_name) -> array_of_procs
+  #   header_convert {|header, field_info| ... } -> array_of_procs
+  #
+  # - With no block, installs a header converter (a \Proc).
+  # - With a block, defines and installs a custom header converter.
+  # - Returns the \Array of installed header converters.
+  #
+  # - Argument +converter_name+, if given, should be the name
+  #   of an existing header converter.
+  #
+  # See {Header Converters}[#class-CSV-label-Header+Converters].
+  # ---
+  #
+  # With no block, installs a header converter:
+  #   csv = CSV.new('')
+  #   csv.header_convert(:symbol)
+  #   csv.header_convert(:downcase)
+  #   csv.header_converters # => [:symbol, :downcase]
+  #
+  # ---
+  #
+  # The block, if given, is called for each header:
+  # - Argument +header+ is the header value.
+  # - Argument +field_info+ is a CSV::FieldInfo object
+  #   containing details about the header.
+  #
+  # The examples here assume the prior execution of:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #
+  # Example giving a block:
+  #   csv = CSV.open(path, headers: true)
+  #   csv.header_convert {|header, field_info| p [header, field_info]; header.upcase }
+  #   table = csv.read
+  #   table # => #<CSV::Table mode:col_or_row row_count:4>
+  #   table.headers # => ["NAME", "VALUE"]
+  #
+  # Output:
+  #   ["Name", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
+  #   ["Value", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
+
+  # The block need not return a \String object:
+  #   csv = CSV.open(path, headers: true)
+  #   csv.header_convert {|header, field_info| header.to_sym }
+  #   table = csv.read
+  #   table.headers # => [:Name, :Value]
+  #
+  # If +converter_name+ is given, the block is not called:
+  #   csv = CSV.open(path, headers: true)
+  #   csv.header_convert(:downcase) {|header, field_info| fail 'Cannot happen' }
+  #   table = csv.read
+  #   table.headers # => ["name", "value"]
+  # ---
+  #
+  # Raises a parse-time exception if +converter_name+ is not the name of a built-in
+  # field converter:
+  #   csv = CSV.open(path, headers: true)
+  #   csv.header_convert(:nosuch)
+  #   # Raises NoMethodError (undefined method `arity' for nil:NilClass)
+  #   csv.read
+  def header_convert(name = nil, &converter)
+    header_fields_converter.add_converter(name, &converter)
+  end
+
+  include Enumerable
+
+  # :call-seq:
+  #   csv.each -> enumerator
+  #   csv.each {|row| ...}
+  #
+  # Calls the block with each successive row.
+  # The data source must be opened for reading.
+  #
+  # Without headers:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.each do |row|
+  #     p row
+  #   end
+  # Output:
+  #   ["foo", "0"]
+  #   ["bar", "1"]
+  #   ["baz", "2"]
+  #
+  # With headers:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string, headers: true)
+  #   csv.each do |row|
+  #     p row
+  #   end
+  # Output:
+  #   <CSV::Row "Name":"foo" "Value":"0">
+  #   <CSV::Row "Name":"bar" "Value":"1">
+  #   <CSV::Row "Name":"baz" "Value":"2">
+  #
+  # ---
+  #
+  # Raises an exception if the source is not opened for reading:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.close
+  #   # Raises IOError (not opened for reading)
+  #   csv.each do |row|
+  #     p row
+  #   end
+  def each(&block)
+    return to_enum(__method__) unless block_given?
+    begin
+      while true
+        yield(parser_enumerator.next)
+      end
+    rescue StopIteration
+    end
+  end
+
+  # :call-seq:
+  #   csv.read -> array or csv_table
+  #
+  # Forms the remaining rows from +self+ into:
+  # - A CSV::Table object, if headers are in use.
+  # - An \Array of Arrays, otherwise.
+  #
+  # The data source must be opened for reading.
+  #
+  # Without headers:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #   csv = CSV.open(path)
+  #   csv.read # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+  #
+  # With headers:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   path = 't.csv'
+  #   File.write(path, string)
+  #   csv = CSV.open(path, headers: true)
+  #   csv.read # => #<CSV::Table mode:col_or_row row_count:4>
+  #
+  # ---
+  #
+  # Raises an exception if the source is not opened for reading:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.close
+  #   # Raises IOError (not opened for reading)
+  #   csv.read
+  def read
+    rows = to_a
+    if parser.use_headers?
+      Table.new(rows, headers: parser.headers)
+    else
+      rows
+    end
+  end
+  alias_method :readlines, :read
+
+  # :call-seq:
+  #   csv.header_row? -> true or false
+  #
+  # Returns +true+ if the next row to be read is a header row\;
+  # +false+ otherwise.
+  #
+  # Without headers:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.header_row? # => false
+  #
+  # With headers:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string, headers: true)
+  #   csv.header_row? # => true
+  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
+  #   csv.header_row? # => false
+  #
+  # ---
+  #
+  # Raises an exception if the source is not opened for reading:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.close
+  #   # Raises IOError (not opened for reading)
+  #   csv.header_row?
+  def header_row?
+    parser.header_row?
+  end
+
+  # :call-seq:
+  #   csv.shift -> array, csv_row, or nil
+  #
+  # Returns the next row of data as:
+  # - An \Array if no headers are used.
+  # - A CSV::Row object if headers are used.
+  #
+  # The data source must be opened for reading.
+  #
+  # Without headers:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.shift # => ["foo", "0"]
+  #   csv.shift # => ["bar", "1"]
+  #   csv.shift # => ["baz", "2"]
+  #   csv.shift # => nil
+  #
+  # With headers:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string, headers: true)
+  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
+  #   csv.shift # => #<CSV::Row "Name":"bar" "Value":"1">
+  #   csv.shift # => #<CSV::Row "Name":"baz" "Value":"2">
+  #   csv.shift # => nil
+  #
+  # ---
+  #
+  # Raises an exception if the source is not opened for reading:
+  #   string = "foo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string)
+  #   csv.close
+  #   # Raises IOError (not opened for reading)
+  #   csv.shift
+  def shift
+    if @eof_error
+      eof_error, @eof_error = @eof_error, nil
+      raise eof_error
+    end
+    begin
+      parser_enumerator.next
+    rescue StopIteration
+      nil
+    end
+  end
+  alias_method :gets,     :shift
+  alias_method :readline, :shift
+
+  # :call-seq:
+  #   csv.inspect -> string
+  #
+  # Returns a \String showing certain properties of +self+:
+  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   csv = CSV.new(string, headers: true)
+  #   s = csv.inspect
+  #   s # => "#<CSV io_type:StringIO encoding:UTF-8 lineno:0 col_sep:\",\" row_sep:\"\\n\" quote_char:\"\\\"\" headers:true>"
+  def inspect
+    str = ["#<", self.class.to_s, " io_type:"]
+    # show type of wrapped IO
+    if    @io == $stdout then str << "$stdout"
+    elsif @io == $stdin  then str << "$stdin"
+    elsif @io == $stderr then str << "$stderr"
+    else                      str << @io.class.to_s
+    end
+    # show IO.path(), if available
+    if @io.respond_to?(:path) and (p = @io.path)
+      str << " io_path:" << p.inspect
+    end
+    # show encoding
+    str << " encoding:" << @encoding.name
+    # show other attributes
+    ["lineno", "col_sep", "row_sep", "quote_char"].each do |attr_name|
+      if a = __send__(attr_name)
+        str << " " << attr_name << ":" << a.inspect
+      end
+    end
+    ["skip_blanks", "liberal_parsing"].each do |attr_name|
+      if a = __send__("#{attr_name}?")
+        str << " " << attr_name << ":" << a.inspect
+      end
+    end
+    _headers = headers
+    str << " headers:" << _headers.inspect if _headers
+    str << ">"
+    begin
+      str.join('')
+    rescue  # any encoding error
+      str.map do |s|
+        e = Encoding::Converter.asciicompat_encoding(s.encoding)
+        e ? s.encode(e) : s.force_encoding("ASCII-8BIT")
+      end.join('')
+    end
+  end
+
+  private
+
+  def determine_encoding(encoding, internal_encoding)
+    # honor the IO encoding if we can, otherwise default to ASCII-8BIT
+    io_encoding = raw_encoding
+    return io_encoding if io_encoding
+
+    return Encoding.find(internal_encoding) if internal_encoding
+
+    if encoding
+      encoding, = encoding.split(":", 2) if encoding.is_a?(String)
+      return Encoding.find(encoding)
+    end
+
+    Encoding.default_internal || Encoding.default_external
+  end
+
+  def normalize_converters(converters)
+    converters ||= []
+    unless converters.is_a?(Array)
+      converters = [converters]
+    end
+    converters.collect do |converter|
+      case converter
+      when Proc # custom code block
+        [nil, converter]
+      else # by name
+        [converter, nil]
+      end
+    end
+  end
+
+  #
+  # Processes +fields+ with <tt>@converters</tt>, or <tt>@header_converters</tt>
+  # if +headers+ is passed as +true+, returning the converted field set. Any
+  # converter that changes the field into something other than a String halts
+  # the pipeline of conversion for that field. This is primarily an efficiency
+  # shortcut.
+  #
+  def convert_fields(fields, headers = false)
+    if headers
+      header_fields_converter.convert(fields, nil, 0)
+    else
+      parser_fields_converter.convert(fields, @headers, lineno)
+    end
+  end
+
+  #
+  # Returns the encoding of the internal IO object.
+  #
+  def raw_encoding
+    if @io.respond_to? :internal_encoding
+      @io.internal_encoding || @io.external_encoding
+    elsif @io.respond_to? :encoding
+      @io.encoding
+    else
+      nil
+    end
+  end
+
+  def parser_fields_converter
+    @parser_fields_converter ||= build_parser_fields_converter
+  end
+
+  def build_parser_fields_converter
+    specific_options = {
+      builtin_converters_name: :Converters,
+    }
+    options = @base_fields_converter_options.merge(specific_options)
+    build_fields_converter(@initial_converters, options)
+  end
+
+  def header_fields_converter
+    @header_fields_converter ||= build_header_fields_converter
+  end
+
+  def build_header_fields_converter
+    specific_options = {
+      builtin_converters_name: :HeaderConverters,
+      accept_nil: true,
+    }
+    options = @base_fields_converter_options.merge(specific_options)
+    build_fields_converter(@initial_header_converters, options)
+  end
+
+  def writer_fields_converter
+    @writer_fields_converter ||= build_writer_fields_converter
+  end
+
+  def build_writer_fields_converter
+    build_fields_converter(@initial_write_converters,
+                           @write_fields_converter_options)
+  end
+
+  def build_fields_converter(initial_converters, options)
+    fields_converter = FieldsConverter.new(options)
+    normalize_converters(initial_converters).each do |name, converter|
+      fields_converter.add_converter(name, &converter)
+    end
+    fields_converter
+  end
+
+  def parser
+    @parser ||= Parser.new(@io, parser_options)
+  end
+
+  def parser_options
+    @parser_options.merge(header_fields_converter: header_fields_converter,
+                          fields_converter: parser_fields_converter)
+  end
+
+  def parser_enumerator
+    @parser_enumerator ||= parser.parse
+  end
+
+  def writer
+    @writer ||= Writer.new(@io, writer_options)
+  end
+
+  def writer_options
+    @writer_options.merge(header_fields_converter: header_fields_converter,
+                          fields_converter: writer_fields_converter)
+  end
+end
+
+# Passes +args+ to CSV::instance.
+#
+#   CSV("CSV,data").read
+#     #=> [["CSV", "data"]]
+#
+# If a block is given, the instance is passed the block and the return value
+# becomes the return value of the block.
+#
+#   CSV("CSV,data") { |c|
+#     c.read.any? { |a| a.include?("data") }
+#   } #=> true
+#
+#   CSV("CSV,data") { |c|
+#     c.read.any? { |a| a.include?("zombies") }
+#   } #=> false
+#
+# CSV options may also be given.
+#
+#   io = StringIO.new
+#   CSV(io, col_sep: ";") { |csv| csv << ["a", "b", "c"] }
+#
+# This API is not Ractor-safe.
+#
+def CSV(*args, **options, &block)
+  CSV.instance(*args, **options, &block)
+end
+
+require_relative "csv/version"
+require_relative "csv/core_ext/array"
+require_relative "csv/core_ext/string"
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/array.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/array.rb
new file mode 100644
index 0000000..ad1b881
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/array.rb
@@ -0,0 +1,9 @@
+class Array
+  # Equivalent to CSV::generate_line(self, options)
+  #
+  #   ["CSV", "data"].to_csv
+  #     #=> "CSV,data\n"
+  def to_csv(**options)
+    CSV.generate_line(self, **options)
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/string.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/string.rb
new file mode 100644
index 0000000..61286d0
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/core_ext/string.rb
@@ -0,0 +1,9 @@
+class String
+  # Equivalent to CSV::parse_line(self, options)
+  #
+  #   "CSV,data".parse_csv
+  #     #=> ["CSV", "data"]
+  def parse_csv(**options)
+    CSV.parse_line(self, **options)
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/fields_converter.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/fields_converter.rb
new file mode 100644
index 0000000..8ea1340
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/fields_converter.rb
@@ -0,0 +1,96 @@
+# frozen_string_literal: true
+
+class CSV
+  # Note: Don't use this class directly. This is an internal class.
+  class FieldsConverter
+    include Enumerable
+
+    NO_QUOTED_FIELDS = [] # :nodoc:
+    def NO_QUOTED_FIELDS.[](_index)
+      false
+    end
+    NO_QUOTED_FIELDS.freeze
+
+    #
+    # A CSV::FieldsConverter is a data structure for storing the
+    # fields converter properties to be passed as a parameter
+    # when parsing a new file (e.g. CSV::Parser.new(@io, parser_options))
+    #
+
+    def initialize(options={})
+      @converters = []
+      @nil_value = options[:nil_value]
+      @empty_value = options[:empty_value]
+      @empty_value_is_empty_string = (@empty_value == "")
+      @accept_nil = options[:accept_nil]
+      @builtin_converters_name = options[:builtin_converters_name]
+      @need_static_convert = need_static_convert?
+    end
+
+    def add_converter(name=nil, &converter)
+      if name.nil?  # custom converter
+        @converters << converter
+      else          # named converter
+        combo = builtin_converters[name]
+        case combo
+        when Array  # combo converter
+          combo.each do |sub_name|
+            add_converter(sub_name)
+          end
+        else        # individual named converter
+          @converters << combo
+        end
+      end
+    end
+
+    def each(&block)
+      @converters.each(&block)
+    end
+
+    def empty?
+      @converters.empty?
+    end
+
+    def convert(fields, headers, lineno, quoted_fields=NO_QUOTED_FIELDS)
+      return fields unless need_convert?
+
+      fields.collect.with_index do |field, index|
+        if field.nil?
+          field = @nil_value
+        elsif field.is_a?(String) and field.empty?
+          field = @empty_value unless @empty_value_is_empty_string
+        end
+        @converters.each do |converter|
+          break if field.nil? and @accept_nil
+          if converter.arity == 1  # straight field converter
+            field = converter[field]
+          else                     # FieldInfo converter
+            if headers
+              header = headers[index]
+            else
+              header = nil
+            end
+            quoted = quoted_fields[index]
+            field = converter[field, FieldInfo.new(index, lineno, header, quoted)]
+          end
+          break unless field.is_a?(String)  # short-circuit pipeline for speed
+        end
+        field  # final state of each field, converted or original
+      end
+    end
+
+    private
+    def need_static_convert?
+      not (@nil_value.nil? and @empty_value_is_empty_string)
+    end
+
+    def need_convert?
+      @need_static_convert or
+        (not @converters.empty?)
+    end
+
+    def builtin_converters
+      @builtin_converters ||= ::CSV.const_get(@builtin_converters_name)
+    end
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/input_record_separator.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/input_record_separator.rb
new file mode 100644
index 0000000..7a99343
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/input_record_separator.rb
@@ -0,0 +1,18 @@
+require "English"
+require "stringio"
+
+class CSV
+  module InputRecordSeparator
+    class << self
+      if RUBY_VERSION >= "3.0.0"
+        def value
+          "\n"
+        end
+      else
+        def value
+          $INPUT_RECORD_SEPARATOR
+        end
+      end
+    end
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/parser.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/parser.rb
new file mode 100644
index 0000000..4a74e40
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/parser.rb
@@ -0,0 +1,1302 @@
+# frozen_string_literal: true
+
+require "strscan"
+
+require_relative "input_record_separator"
+require_relative "row"
+require_relative "table"
+
+class CSV
+  # Note: Don't use this class directly. This is an internal class.
+  class Parser
+    #
+    # A CSV::Parser is m17n aware. The parser works in the Encoding of the IO
+    # or String object being read from or written to. Your data is never transcoded
+    # (unless you ask Ruby to transcode it for you) and will literally be parsed in
+    # the Encoding it is in. Thus CSV will return Arrays or Rows of Strings in the
+    # Encoding of your data. This is accomplished by transcoding the parser itself
+    # into your Encoding.
+    #
+
+    class << self
+      ARGF_OBJECT_ID = ARGF.object_id
+      # Convenient method to check whether the give input reached EOF
+      # or not.
+      def eof?(input)
+        # We can't use input != ARGF in Ractor. Because ARGF isn't a
+        # shareable object.
+        input.object_id != ARGF_OBJECT_ID and
+          input.respond_to?(:eof) and
+          input.eof?
+      end
+    end
+
+    # Raised when encoding is invalid.
+    class InvalidEncoding < StandardError
+    end
+
+    # Raised when unexpected case is happen.
+    class UnexpectedError < StandardError
+    end
+
+    #
+    # CSV::Scanner receives a CSV output, scans it and return the content.
+    # It also controls the life cycle of the object with its methods +keep_start+,
+    # +keep_end+, +keep_back+, +keep_drop+.
+    #
+    # Uses StringScanner (the official strscan gem). Strscan provides lexical
+    # scanning operations on a String. We inherit its object and take advantage
+    # on the methods. For more information, please visit:
+    # https://docs.ruby-lang.org/en/master/StringScanner.html
+    #
+    class Scanner < StringScanner
+      alias_method :scan_all, :scan
+
+      def initialize(*args)
+        super
+        @keeps = []
+      end
+
+      def each_line(row_separator)
+        position = pos
+        rest.each_line(row_separator) do |line|
+          position += line.bytesize
+          self.pos = position
+          yield(line)
+        end
+      end
+
+      def keep_start
+        @keeps.push(pos)
+      end
+
+      def keep_end
+        start = @keeps.pop
+        string.byteslice(start, pos - start)
+      end
+
+      def keep_back
+        self.pos = @keeps.pop
+      end
+
+      def keep_drop
+        @keeps.pop
+      end
+    end
+
+    #
+    # CSV::InputsScanner receives IO inputs, encoding and the chunk_size.
+    # It also controls the life cycle of the object with its methods +keep_start+,
+    # +keep_end+, +keep_back+, +keep_drop+.
+    #
+    # CSV::InputsScanner.scan() tries to match with pattern at the current position.
+    # If there's a match, the scanner advances the "scan pointer" and returns the matched string.
+    # Otherwise, the scanner returns nil.
+    #
+    # CSV::InputsScanner.rest() returns the "rest" of the string (i.e. everything after the scan pointer).
+    # If there is no more data (eos? = true), it returns "".
+    #
+    class InputsScanner
+      def initialize(inputs, encoding, row_separator, chunk_size: 8192)
+        @inputs = inputs.dup
+        @encoding = encoding
+        @row_separator = row_separator
+        @chunk_size = chunk_size
+        @last_scanner = @inputs.empty?
+        @keeps = []
+        read_chunk
+      end
+
+      def each_line(row_separator)
+        return enum_for(__method__, row_separator) unless block_given?
+        buffer = nil
+        input = @scanner.rest
+        position = @scanner.pos
+        offset = 0
+        n_row_separator_chars = row_separator.size
+        # trace(__method__, :start, input)
+        while true
+          input.each_line(row_separator) do |line|
+            @scanner.pos += line.bytesize
+            if buffer
+              if n_row_separator_chars == 2 and
+                buffer.end_with?(row_separator[0]) and
+                line.start_with?(row_separator[1])
+                buffer << line[0]
+                line = line[1..-1]
+                position += buffer.bytesize + offset
+                @scanner.pos = position
+                offset = 0
+                yield(buffer)
+                buffer = nil
+                next if line.empty?
+              else
+                buffer << line
+                line = buffer
+                buffer = nil
+              end
+            end
+            if line.end_with?(row_separator)
+              position += line.bytesize + offset
+              @scanner.pos = position
+              offset = 0
+              yield(line)
+            else
+              buffer = line
+            end
+          end
+          break unless read_chunk
+          input = @scanner.rest
+          position = @scanner.pos
+          offset = -buffer.bytesize if buffer
+        end
+        yield(buffer) if buffer
+      end
+
+      def scan(pattern)
+        # trace(__method__, pattern, :start)
+        value = @scanner.scan(pattern)
+        # trace(__method__, pattern, :done, :last, value) if @last_scanner
+        return value if @last_scanner
+
+        read_chunk if value and @scanner.eos?
+        # trace(__method__, pattern, :done, value)
+        value
+      end
+
+      def scan_all(pattern)
+        # trace(__method__, pattern, :start)
+        value = @scanner.scan(pattern)
+        # trace(__method__, pattern, :done, :last, value) if @last_scanner
+        return value if @last_scanner
+
+        # trace(__method__, pattern, :done, :nil) if value.nil?
+        return nil if value.nil?
+        while @scanner.eos? and read_chunk and (sub_value = @scanner.scan(pattern))
+          # trace(__method__, pattern, :sub, sub_value)
+          value << sub_value
+        end
+        # trace(__method__, pattern, :done, value)
+        value
+      end
+
+      def eos?
+        @scanner.eos?
+      end
+
+      def keep_start
+        # trace(__method__, :start)
+        adjust_last_keep
+        @keeps.push([@scanner, @scanner.pos, nil])
+        # trace(__method__, :done)
+      end
+
+      def keep_end
+        # trace(__method__, :start)
+        scanner, start, buffer = @keeps.pop
+        if scanner == @scanner
+          keep = @scanner.string.byteslice(start, @scanner.pos - start)
+        else
+          keep = @scanner.string.byteslice(0, @scanner.pos)
+        end
+        if buffer
+          buffer << keep
+          keep = buffer
+        end
+        # trace(__method__, :done, keep)
+        keep
+      end
+
+      def keep_back
+        # trace(__method__, :start)
+        scanner, start, buffer = @keeps.pop
+        if buffer
+          # trace(__method__, :rescan, start, buffer)
+          string = @scanner.string
+          if scanner == @scanner
+            keep = string.byteslice(start,
+                                    string.bytesize - @scanner.pos - start)
+          else
+            keep = string
+          end
+          if keep and not keep.empty?
+            @inputs.unshift(StringIO.new(keep))
+            @last_scanner = false
+          end
+          @scanner = StringScanner.new(buffer)
+        else
+          if @scanner != scanner
+            message = "scanners are different but no buffer: "
+            message += "#{@scanner.inspect}(#{@scanner.object_id}): "
+            message += "#{scanner.inspect}(#{scanner.object_id})"
+            raise UnexpectedError, message
+          end
+          # trace(__method__, :repos, start, buffer)
+          @scanner.pos = start
+          last_scanner, last_start, last_buffer = @keeps.last
+          # Drop the last buffer when the last buffer is the same data
+          # in the last keep. If we keep it, we have duplicated data
+          # by the next keep_back.
+          if last_scanner == @scanner and
+            last_buffer and
+            last_buffer == last_scanner.string.byteslice(last_start, start)
+            @keeps.last[2] = nil
+          end
+        end
+        read_chunk if @scanner.eos?
+      end
+
+      def keep_drop
+        _, _, buffer = @keeps.pop
+        # trace(__method__, :done, :empty) unless buffer
+        return unless buffer
+
+        last_keep = @keeps.last
+        # trace(__method__, :done, :no_last_keep) unless last_keep
+        return unless last_keep
+
+        if last_keep[2]
+          last_keep[2] << buffer
+        else
+          last_keep[2] = buffer
+        end
+        # trace(__method__, :done)
+      end
+
+      def rest
+        @scanner.rest
+      end
+
+      def check(pattern)
+        @scanner.check(pattern)
+      end
+
+      private
+      def trace(*args)
+        pp([*args, @scanner, @scanner&.string, @scanner&.pos, @keeps])
+      end
+
+      def adjust_last_keep
+        # trace(__method__, :start)
+
+        keep = @keeps.last
+        # trace(__method__, :done, :empty) if keep.nil?
+        return if keep.nil?
+
+        scanner, start, buffer = keep
+        string = @scanner.string
+        if @scanner != scanner
+          start = 0
+        end
+        if start == 0 and @scanner.eos?
+          keep_data = string
+        else
+          keep_data = string.byteslice(start, @scanner.pos - start)
+        end
+        if keep_data
+          if buffer
+            buffer << keep_data
+          else
+            keep[2] = keep_data.dup
+          end
+        end
+
+        # trace(__method__, :done)
+      end
+
+      def read_chunk
+        return false if @last_scanner
+
+        adjust_last_keep
+
+        input = @inputs.first
+        case input
+        when StringIO
+          string = input.read
+          raise InvalidEncoding unless string.valid_encoding?
+          # trace(__method__, :stringio, string)
+          @scanner = StringScanner.new(string)
+          @inputs.shift
+          @last_scanner = @inputs.empty?
+          true
+        else
+          chunk = input.gets(@row_separator, @chunk_size)
+          if chunk
+            raise InvalidEncoding unless chunk.valid_encoding?
+            # trace(__method__, :chunk, chunk)
+            @scanner = StringScanner.new(chunk)
+            if Parser.eof?(input)
+              @inputs.shift
+              @last_scanner = @inputs.empty?
+            end
+            true
+          else
+            # trace(__method__, :no_chunk)
+            @scanner = StringScanner.new("".encode(@encoding))
+            @inputs.shift
+            @last_scanner = @inputs.empty?
+            if @last_scanner
+              false
+            else
+              read_chunk
+            end
+          end
+        end
+      end
+    end
+
+    def initialize(input, options)
+      @input = input
+      @options = options
+      @samples = []
+
+      prepare
+    end
+
+    def column_separator
+      @column_separator
+    end
+
+    def row_separator
+      @row_separator
+    end
+
+    def quote_character
+      @quote_character
+    end
+
+    def field_size_limit
+      @max_field_size&.succ
+    end
+
+    def max_field_size
+      @max_field_size
+    end
+
+    def skip_lines
+      @skip_lines
+    end
+
+    def unconverted_fields?
+      @unconverted_fields
+    end
+
+    def headers
+      @headers
+    end
+
+    def header_row?
+      @use_headers and @headers.nil?
+    end
+
+    def return_headers?
+      @return_headers
+    end
+
+    def skip_blanks?
+      @skip_blanks
+    end
+
+    def liberal_parsing?
+      @liberal_parsing
+    end
+
+    def lineno
+      @lineno
+    end
+
+    def line
+      last_line
+    end
+
+    def parse(&block)
+      return to_enum(__method__) unless block_given?
+
+      if @return_headers and @headers and @raw_headers
+        headers = Row.new(@headers, @raw_headers, true)
+        if @unconverted_fields
+          headers = add_unconverted_fields(headers, [])
+        end
+        yield headers
+      end
+
+      begin
+        @scanner ||= build_scanner
+        __send__(@parse_method, &block)
+      rescue InvalidEncoding
+        if @scanner
+          ignore_broken_line
+          lineno = @lineno
+        else
+          lineno = @lineno + 1
+        end
+        raise InvalidEncodingError.new(@encoding, lineno)
+      rescue UnexpectedError => error
+        if @scanner
+          ignore_broken_line
+          lineno = @lineno
+        else
+          lineno = @lineno + 1
+        end
+        message = "This should not be happen: #{error.message}: "
+        message += "Please report this to https://github.com/ruby/csv/issues"
+        raise MalformedCSVError.new(message, lineno)
+      end
+    end
+
+    def use_headers?
+      @use_headers
+    end
+
+    private
+    # A set of tasks to prepare the file in order to parse it
+    def prepare
+      prepare_variable
+      prepare_quote_character
+      prepare_backslash
+      prepare_skip_lines
+      prepare_strip
+      prepare_separators
+      validate_strip_and_col_sep_options
+      prepare_quoted
+      prepare_unquoted
+      prepare_line
+      prepare_header
+      prepare_parser
+    end
+
+    def prepare_variable
+      @encoding = @options[:encoding]
+      liberal_parsing = @options[:liberal_parsing]
+      if liberal_parsing
+        @liberal_parsing = true
+        if liberal_parsing.is_a?(Hash)
+          @double_quote_outside_quote =
+            liberal_parsing[:double_quote_outside_quote]
+          @backslash_quote = liberal_parsing[:backslash_quote]
+        else
+          @double_quote_outside_quote = false
+          @backslash_quote = false
+        end
+      else
+        @liberal_parsing = false
+        @backslash_quote = false
+      end
+      @unconverted_fields = @options[:unconverted_fields]
+      @max_field_size = @options[:max_field_size]
+      @skip_blanks = @options[:skip_blanks]
+      @fields_converter = @options[:fields_converter]
+      @header_fields_converter = @options[:header_fields_converter]
+    end
+
+    def prepare_quote_character
+      @quote_character = @options[:quote_character]
+      if @quote_character.nil?
+        @escaped_quote_character = nil
+        @escaped_quote = nil
+      else
+        @quote_character = @quote_character.to_s.encode(@encoding)
+        if @quote_character.length != 1
+          message = ":quote_char has to be nil or a single character String"
+          raise ArgumentError, message
+        end
+        @escaped_quote_character = Regexp.escape(@quote_character)
+        @escaped_quote = Regexp.new(@escaped_quote_character)
+      end
+    end
+
+    def prepare_backslash
+      return unless @backslash_quote
+
+      @backslash_character = "\\".encode(@encoding)
+
+      @escaped_backslash_character = Regexp.escape(@backslash_character)
+      @escaped_backslash = Regexp.new(@escaped_backslash_character)
+      if @quote_character.nil?
+        @backslash_quote_character = nil
+      else
+        @backslash_quote_character =
+          @backslash_character + @escaped_quote_character
+      end
+    end
+
+    def prepare_skip_lines
+      skip_lines = @options[:skip_lines]
+      case skip_lines
+      when String
+        @skip_lines = skip_lines.encode(@encoding)
+      when Regexp, nil
+        @skip_lines = skip_lines
+      else
+        unless skip_lines.respond_to?(:match)
+          message =
+            ":skip_lines has to respond to \#match: #{skip_lines.inspect}"
+          raise ArgumentError, message
+        end
+        @skip_lines = skip_lines
+      end
+    end
+
+    def prepare_strip
+      @strip = @options[:strip]
+      @escaped_strip = nil
+      @strip_value = nil
+      @rstrip_value = nil
+      if @strip.is_a?(String)
+        case @strip.length
+        when 0
+          raise ArgumentError, ":strip must not be an empty String"
+        when 1
+          # ok
+        else
+          raise ArgumentError, ":strip doesn't support 2 or more characters yet"
+        end
+        @strip = @strip.encode(@encoding)
+        @escaped_strip = Regexp.escape(@strip)
+        if @quote_character
+          @strip_value = Regexp.new(@escaped_strip +
+                                    "+".encode(@encoding))
+          @rstrip_value = Regexp.new(@escaped_strip +
+                                     "+\\z".encode(@encoding))
+        end
+      elsif @strip
+        strip_values = " \t\f\v"
+        @escaped_strip = strip_values.encode(@encoding)
+        if @quote_character
+          @strip_value = Regexp.new("[#{strip_values}]+".encode(@encoding))
+          @rstrip_value = Regexp.new("[#{strip_values}]+\\z".encode(@encoding))
+        end
+      end
+    end
+
+    begin
+      StringScanner.new("x").scan("x")
+    rescue TypeError
+      STRING_SCANNER_SCAN_ACCEPT_STRING = false
+    else
+      STRING_SCANNER_SCAN_ACCEPT_STRING = true
+    end
+
+    def prepare_separators
+      column_separator = @options[:column_separator]
+      @column_separator = column_separator.to_s.encode(@encoding)
+      if @column_separator.size < 1
+        message = ":col_sep must be 1 or more characters: "
+        message += column_separator.inspect
+        raise ArgumentError, message
+      end
+      @row_separator =
+        resolve_row_separator(@options[:row_separator]).encode(@encoding)
+
+      @escaped_column_separator = Regexp.escape(@column_separator)
+      @escaped_first_column_separator = Regexp.escape(@column_separator[0])
+      if @column_separator.size > 1
+        @column_end = Regexp.new(@escaped_column_separator)
+        @column_ends = @column_separator.each_char.collect do |char|
+          Regexp.new(Regexp.escape(char))
+        end
+        @first_column_separators = Regexp.new(@escaped_first_column_separator +
+                                              "+".encode(@encoding))
+      else
+        if STRING_SCANNER_SCAN_ACCEPT_STRING
+          @column_end = @column_separator
+        else
+          @column_end = Regexp.new(@escaped_column_separator)
+        end
+        @column_ends = nil
+        @first_column_separators = nil
+      end
+
+      escaped_row_separator = Regexp.escape(@row_separator)
+      @row_end = Regexp.new(escaped_row_separator)
+      if @row_separator.size > 1
+        @row_ends = @row_separator.each_char.collect do |char|
+          Regexp.new(Regexp.escape(char))
+        end
+      else
+        @row_ends = nil
+      end
+
+      @cr = "\r".encode(@encoding)
+      @lf = "\n".encode(@encoding)
+      @line_end = Regexp.new("\r\n|\n|\r".encode(@encoding))
+      @not_line_end = Regexp.new("[^\r\n]+".encode(@encoding))
+    end
+
+    # This method verifies that there are no (obvious) ambiguities with the
+    # provided +col_sep+ and +strip+ parsing options. For example, if +col_sep+
+    # and +strip+ were both equal to +\t+, then there would be no clear way to
+    # parse the input.
+    def validate_strip_and_col_sep_options
+      return unless @strip
+
+      if @strip.is_a?(String)
+        if @column_separator.start_with?(@strip) || @column_separator.end_with?(@strip)
+          raise ArgumentError,
+                "The provided strip (#{@escaped_strip}) and " \
+                "col_sep (#{@escaped_column_separator}) options are incompatible."
+        end
+      else
+        if Regexp.new("\\A[#{@escaped_strip}]|[#{@escaped_strip}]\\z").match?(@column_separator)
+          raise ArgumentError,
+                "The provided strip (true) and " \
+                "col_sep (#{@escaped_column_separator}) options are incompatible."
+        end
+      end
+    end
+
+    def prepare_quoted
+      if @quote_character
+        @quotes = Regexp.new(@escaped_quote_character +
+                             "+".encode(@encoding))
+        no_quoted_values = @escaped_quote_character.dup
+        if @backslash_quote
+          no_quoted_values << @escaped_backslash_character
+        end
+        @quoted_value = Regexp.new("[^".encode(@encoding) +
+                                   no_quoted_values +
+                                   "]+".encode(@encoding))
+      end
+      if @escaped_strip
+        @split_column_separator = Regexp.new(@escaped_strip +
+                                             "*".encode(@encoding) +
+                                             @escaped_column_separator +
+                                             @escaped_strip +
+                                             "*".encode(@encoding))
+      else
+        if @column_separator == " ".encode(@encoding)
+          @split_column_separator = Regexp.new(@escaped_column_separator)
+        else
+          @split_column_separator = @column_separator
+        end
+      end
+    end
+
+    def prepare_unquoted
+      return if @quote_character.nil?
+
+      no_unquoted_values = "\r\n".encode(@encoding)
+      no_unquoted_values << @escaped_first_column_separator
+      unless @liberal_parsing
+        no_unquoted_values << @escaped_quote_character
+      end
+      @unquoted_value = Regexp.new("[^".encode(@encoding) +
+                                   no_unquoted_values +
+                                   "]+".encode(@encoding))
+    end
+
+    def resolve_row_separator(separator)
+      if separator == :auto
+        cr = "\r".encode(@encoding)
+        lf = "\n".encode(@encoding)
+        if @input.is_a?(StringIO)
+          pos = @input.pos
+          separator = detect_row_separator(@input.read, cr, lf)
+          @input.seek(pos)
+        elsif @input.respond_to?(:gets)
+          if @input.is_a?(File)
+            chunk_size = 32 * 1024
+          else
+            chunk_size = 1024
+          end
+          begin
+            while separator == :auto
+              #
+              # if we run out of data, it's probably a single line
+              # (ensure will set default value)
+              #
+              break unless sample = @input.gets(nil, chunk_size)
+
+              # extend sample if we're unsure of the line ending
+              if sample.end_with?(cr)
+                sample << (@input.gets(nil, 1) || "")
+              end
+
+              @samples << sample
+
+              separator = detect_row_separator(sample, cr, lf)
+            end
+          rescue IOError
+            # do nothing:  ensure will set default
+          end
+        end
+        separator = InputRecordSeparator.value if separator == :auto
+      end
+      separator.to_s.encode(@encoding)
+    end
+
+    def detect_row_separator(sample, cr, lf)
+      lf_index = sample.index(lf)
+      if lf_index
+        cr_index = sample[0, lf_index].index(cr)
+      else
+        cr_index = sample.index(cr)
+      end
+      if cr_index and lf_index
+        if cr_index + 1 == lf_index
+          cr + lf
+        elsif cr_index < lf_index
+          cr
+        else
+          lf
+        end
+      elsif cr_index
+        cr
+      elsif lf_index
+        lf
+      else
+        :auto
+      end
+    end
+
+    def prepare_line
+      @lineno = 0
+      @last_line = nil
+      @scanner = nil
+    end
+
+    def last_line
+      if @scanner
+        @last_line ||= @scanner.keep_end
+      else
+        @last_line
+      end
+    end
+
+    def prepare_header
+      @return_headers = @options[:return_headers]
+
+      headers = @options[:headers]
+      case headers
+      when Array
+        @raw_headers = headers
+        quoted_fields = FieldsConverter::NO_QUOTED_FIELDS
+        @use_headers = true
+      when String
+        @raw_headers, quoted_fields = parse_headers(headers)
+        @use_headers = true
+      when nil, false
+        @raw_headers = nil
+        @use_headers = false
+      else
+        @raw_headers = nil
+        @use_headers = true
+      end
+      if @raw_headers
+        @headers = adjust_headers(@raw_headers, quoted_fields)
+      else
+        @headers = nil
+      end
+    end
+
+    def parse_headers(row)
+      quoted_fields = []
+      converter = lambda do |field, info|
+        quoted_fields << info.quoted?
+        field
+      end
+      headers = CSV.parse_line(row,
+                               col_sep:    @column_separator,
+                               row_sep:    @row_separator,
+                               quote_char: @quote_character,
+                               converters: [converter])
+      [headers, quoted_fields]
+    end
+
+    def adjust_headers(headers, quoted_fields)
+      adjusted_headers = @header_fields_converter.convert(headers, nil, @lineno, quoted_fields)
+      adjusted_headers.each {|h| h.freeze if h.is_a? String}
+      adjusted_headers
+    end
+
+    def prepare_parser
+      @may_quoted = may_quoted?
+      if @quote_character.nil?
+        @parse_method = :parse_no_quote
+      elsif @liberal_parsing or @strip
+        @parse_method = :parse_quotable_robust
+      else
+        @parse_method = :parse_quotable_loose
+      end
+    end
+
+    def may_quoted?
+      return false if @quote_character.nil?
+
+      if @input.is_a?(StringIO)
+        pos = @input.pos
+        sample = @input.read
+        @input.seek(pos)
+      else
+        return false if @samples.empty?
+        sample = @samples.first
+      end
+      sample[0, 128].index(@quote_character)
+    end
+
+    class UnoptimizedStringIO # :nodoc:
+      def initialize(string)
+        @io = StringIO.new(string, "rb:#{string.encoding}")
+      end
+
+      def gets(*args)
+        @io.gets(*args)
+      end
+
+      def each_line(*args, &block)
+        @io.each_line(*args, &block)
+      end
+
+      def eof?
+        @io.eof?
+      end
+    end
+
+    SCANNER_TEST = (ENV["CSV_PARSER_SCANNER_TEST"] == "yes")
+    if SCANNER_TEST
+      SCANNER_TEST_CHUNK_SIZE_NAME = "CSV_PARSER_SCANNER_TEST_CHUNK_SIZE"
+      SCANNER_TEST_CHUNK_SIZE_VALUE = ENV[SCANNER_TEST_CHUNK_SIZE_NAME]
+      def build_scanner
+        inputs = @samples.collect do |sample|
+          UnoptimizedStringIO.new(sample)
+        end
+        if @input.is_a?(StringIO)
+          inputs << UnoptimizedStringIO.new(@input.read)
+        else
+          inputs << @input
+        end
+        begin
+          chunk_size_value = ENV[SCANNER_TEST_CHUNK_SIZE_NAME]
+        rescue # Ractor::IsolationError
+          # Ractor on Ruby 3.0 can't read ENV value.
+          chunk_size_value = SCANNER_TEST_CHUNK_SIZE_VALUE
+        end
+        chunk_size = Integer((chunk_size_value || "1"), 10)
+        InputsScanner.new(inputs,
+                          @encoding,
+                          @row_separator,
+                          chunk_size: chunk_size)
+      end
+    else
+      def build_scanner
+        string = nil
+        if @samples.empty? and @input.is_a?(StringIO)
+          string = @input.read
+        elsif @samples.size == 1 and Parser.eof?(@input)
+          string = @samples[0]
+        end
+        if string
+          unless string.valid_encoding?
+            index = string.lines(@row_separator).index do |line|
+              !line.valid_encoding?
+            end
+            if index
+              raise InvalidEncodingError.new(@encoding, @lineno + index + 1)
+            end
+          end
+          Scanner.new(string)
+        else
+          inputs = @samples.collect do |sample|
+            StringIO.new(sample)
+          end
+          inputs << @input
+          InputsScanner.new(inputs, @encoding, @row_separator)
+        end
+      end
+    end
+
+    def skip_needless_lines
+      return unless @skip_lines
+
+      until @scanner.eos?
+        @scanner.keep_start
+        line = @scanner.scan_all(@not_line_end) || "".encode(@encoding)
+        line << @row_separator if parse_row_end
+        if skip_line?(line)
+          @lineno += 1
+          @scanner.keep_drop
+        else
+          @scanner.keep_back
+          return
+        end
+      end
+    end
+
+    def skip_line?(line)
+      line = line.delete_suffix(@row_separator)
+      case @skip_lines
+      when String
+        line.include?(@skip_lines)
+      when Regexp
+        @skip_lines.match?(line)
+      else
+        @skip_lines.match(line)
+      end
+    end
+
+    def validate_field_size(field)
+      return unless @max_field_size
+      return if field.size <= @max_field_size
+      ignore_broken_line
+      message = "Field size exceeded: #{field.size} > #{@max_field_size}"
+      raise MalformedCSVError.new(message, @lineno)
+    end
+
+    def parse_no_quote(&block)
+      @scanner.each_line(@row_separator) do |line|
+        next if @skip_lines and skip_line?(line)
+        original_line = line
+        line = line.delete_suffix(@row_separator)
+
+        if line.empty?
+          next if @skip_blanks
+          row = []
+        else
+          line = strip_value(line)
+          row = line.split(@split_column_separator, -1)
+          if @max_field_size
+            row.each do |column|
+              validate_field_size(column)
+            end
+          end
+          n_columns = row.size
+          i = 0
+          while i < n_columns
+            row[i] = nil if row[i].empty?
+            i += 1
+          end
+        end
+        @last_line = original_line
+        emit_row(row, &block)
+      end
+    end
+
+    def parse_quotable_loose(&block)
+      @scanner.keep_start
+      @scanner.each_line(@row_separator) do |line|
+        if @skip_lines and skip_line?(line)
+          @scanner.keep_drop
+          @scanner.keep_start
+          next
+        end
+        original_line = line
+        line = line.delete_suffix(@row_separator)
+
+        if line.empty?
+          if @skip_blanks
+            @scanner.keep_drop
+            @scanner.keep_start
+            next
+          end
+          row = []
+          quoted_fields = FieldsConverter::NO_QUOTED_FIELDS
+        elsif line.include?(@cr) or line.include?(@lf)
+          @scanner.keep_back
+          @parse_method = :parse_quotable_robust
+          return parse_quotable_robust(&block)
+        else
+          row = line.split(@split_column_separator, -1)
+          quoted_fields = []
+          n_columns = row.size
+          i = 0
+          while i < n_columns
+            column = row[i]
+            if column.empty?
+              quoted_fields << false
+              row[i] = nil
+            else
+              n_quotes = column.count(@quote_character)
+              if n_quotes.zero?
+                quoted_fields << false
+                # no quote
+              elsif n_quotes == 2 and
+                   column.start_with?(@quote_character) and
+                   column.end_with?(@quote_character)
+                quoted_fields << true
+                row[i] = column[1..-2]
+              else
+                @scanner.keep_back
+                @parse_method = :parse_quotable_robust
+                return parse_quotable_robust(&block)
+              end
+              validate_field_size(row[i])
+            end
+            i += 1
+          end
+        end
+        @scanner.keep_drop
+        @scanner.keep_start
+        @last_line = original_line
+        emit_row(row, quoted_fields, &block)
+      end
+      @scanner.keep_drop
+    end
+
+    def parse_quotable_robust(&block)
+      row = []
+      quoted_fields = []
+      skip_needless_lines
+      start_row
+      while true
+        @quoted_column_value = false
+        @unquoted_column_value = false
+        @scanner.scan_all(@strip_value) if @strip_value
+        value = parse_column_value
+        if value
+          @scanner.scan_all(@strip_value) if @strip_value
+          validate_field_size(value)
+        end
+        if parse_column_end
+          row << value
+          quoted_fields << @quoted_column_value
+        elsif parse_row_end
+          if row.empty? and value.nil?
+            emit_row([], &block) unless @skip_blanks
+          else
+            row << value
+            quoted_fields << @quoted_column_value
+            emit_row(row, quoted_fields, &block)
+            row = []
+            quoted_fields.clear
+          end
+          skip_needless_lines
+          start_row
+        elsif @scanner.eos?
+          break if row.empty? and value.nil?
+          row << value
+          quoted_fields << @quoted_column_value
+          emit_row(row, quoted_fields, &block)
+          break
+        else
+          if @quoted_column_value
+            if liberal_parsing? and (new_line = @scanner.check(@line_end))
+              message =
+                "Illegal end-of-line sequence outside of a quoted field " +
+                "<#{new_line.inspect}>"
+            else
+              message = "Any value after quoted field isn't allowed"
+            end
+            ignore_broken_line
+            raise MalformedCSVError.new(message, @lineno)
+          elsif @unquoted_column_value and
+                (new_line = @scanner.scan(@line_end))
+            ignore_broken_line
+            message = "Unquoted fields do not allow new line " +
+                      "<#{new_line.inspect}>"
+            raise MalformedCSVError.new(message, @lineno)
+          elsif @scanner.rest.start_with?(@quote_character)
+            ignore_broken_line
+            message = "Illegal quoting"
+            raise MalformedCSVError.new(message, @lineno)
+          elsif (new_line = @scanner.scan(@line_end))
+            ignore_broken_line
+            message = "New line must be <#{@row_separator.inspect}> " +
+                      "not <#{new_line.inspect}>"
+            raise MalformedCSVError.new(message, @lineno)
+          else
+            ignore_broken_line
+            raise MalformedCSVError.new("TODO: Meaningful message",
+                                        @lineno)
+          end
+        end
+      end
+    end
+
+    def parse_column_value
+      if @liberal_parsing
+        quoted_value = parse_quoted_column_value
+        if quoted_value
+          @scanner.scan_all(@strip_value) if @strip_value
+          unquoted_value = parse_unquoted_column_value
+          if unquoted_value
+            if @double_quote_outside_quote
+              unquoted_value = unquoted_value.gsub(@quote_character * 2,
+                                                   @quote_character)
+              if quoted_value.empty? # %Q{""...} case
+                return @quote_character + unquoted_value
+              end
+            end
+            @quote_character + quoted_value + @quote_character + unquoted_value
+          else
+            quoted_value
+          end
+        else
+          parse_unquoted_column_value
+        end
+      elsif @may_quoted
+        parse_quoted_column_value ||
+          parse_unquoted_column_value
+      else
+        parse_unquoted_column_value ||
+          parse_quoted_column_value
+      end
+    end
+
+    def parse_unquoted_column_value
+      value = @scanner.scan_all(@unquoted_value)
+      return nil unless value
+
+      @unquoted_column_value = true
+      if @first_column_separators
+        while true
+          @scanner.keep_start
+          is_column_end = @column_ends.all? do |column_end|
+            @scanner.scan(column_end)
+          end
+          @scanner.keep_back
+          break if is_column_end
+          sub_separator = @scanner.scan_all(@first_column_separators)
+          break if sub_separator.nil?
+          value << sub_separator
+          sub_value = @scanner.scan_all(@unquoted_value)
+          break if sub_value.nil?
+          value << sub_value
+        end
+      end
+      value.gsub!(@backslash_quote_character, @quote_character) if @backslash_quote
+      if @rstrip_value
+        value.gsub!(@rstrip_value, "")
+      end
+      value
+    end
+
+    def parse_quoted_column_value
+      quotes = @scanner.scan_all(@quotes)
+      return nil unless quotes
+
+      @quoted_column_value = true
+      n_quotes = quotes.size
+      if (n_quotes % 2).zero?
+        quotes[0, (n_quotes - 2) / 2]
+      else
+        value = quotes[0, n_quotes / 2]
+        while true
+          quoted_value = @scanner.scan_all(@quoted_value)
+          value << quoted_value if quoted_value
+          if @backslash_quote
+            if @scanner.scan(@escaped_backslash)
+              if @scanner.scan(@escaped_quote)
+                value << @quote_character
+              else
+                value << @backslash_character
+              end
+              next
+            end
+          end
+
+          quotes = @scanner.scan_all(@quotes)
+          unless quotes
+            ignore_broken_line
+            message = "Unclosed quoted field"
+            raise MalformedCSVError.new(message, @lineno)
+          end
+          n_quotes = quotes.size
+          if n_quotes == 1
+            break
+          else
+            value << quotes[0, n_quotes / 2]
+            break if (n_quotes % 2) == 1
+          end
+        end
+        value
+      end
+    end
+
+    def parse_column_end
+      return true if @scanner.scan(@column_end)
+      return false unless @column_ends
+
+      @scanner.keep_start
+      if @column_ends.all? {|column_end| @scanner.scan(column_end)}
+        @scanner.keep_drop
+        true
+      else
+        @scanner.keep_back
+        false
+      end
+    end
+
+    def parse_row_end
+      return true if @scanner.scan(@row_end)
+      return false unless @row_ends
+      @scanner.keep_start
+      if @row_ends.all? {|row_end| @scanner.scan(row_end)}
+        @scanner.keep_drop
+        true
+      else
+        @scanner.keep_back
+        false
+      end
+    end
+
+    def strip_value(value)
+      return value unless @strip
+      return value if value.nil?
+
+      case @strip
+      when String
+        while value.delete_prefix!(@strip)
+          # do nothing
+        end
+        while value.delete_suffix!(@strip)
+          # do nothing
+        end
+      else
+        value.strip!
+      end
+      value
+    end
+
+    def ignore_broken_line
+      @scanner.scan_all(@not_line_end)
+      @scanner.scan_all(@line_end)
+      @lineno += 1
+    end
+
+    def start_row
+      if @last_line
+        @last_line = nil
+      else
+        @scanner.keep_drop
+      end
+      @scanner.keep_start
+    end
+
+    def emit_row(row, quoted_fields=FieldsConverter::NO_QUOTED_FIELDS, &block)
+      @lineno += 1
+
+      raw_row = row
+      if @use_headers
+        if @headers.nil?
+          @headers = adjust_headers(row, quoted_fields)
+          return unless @return_headers
+          row = Row.new(@headers, row, true)
+        else
+          row = Row.new(@headers,
+                        @fields_converter.convert(raw_row, @headers, @lineno, quoted_fields))
+        end
+      else
+        # convert fields, if needed...
+        row = @fields_converter.convert(raw_row, nil, @lineno, quoted_fields)
+      end
+
+      # inject unconverted fields and accessor, if requested...
+      if @unconverted_fields and not row.respond_to?(:unconverted_fields)
+        add_unconverted_fields(row, raw_row)
+      end
+
+      yield(row)
+    end
+
+    # This method injects an instance variable <tt>unconverted_fields</tt> into
+    # +row+ and an accessor method for +row+ called unconverted_fields().  The
+    # variable is set to the contents of +fields+.
+    def add_unconverted_fields(row, fields)
+      class << row
+        attr_reader :unconverted_fields
+      end
+      row.instance_variable_set(:@unconverted_fields, fields)
+      row
+    end
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/row.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/row.rb
new file mode 100644
index 0000000..86323f7
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/row.rb
@@ -0,0 +1,757 @@
+# frozen_string_literal: true
+
+require "forwardable"
+
+class CSV
+  # = \CSV::Row
+  # A \CSV::Row instance represents a \CSV table row.
+  # (see {class CSV}[../CSV.html]).
+  #
+  # The instance may have:
+  # - Fields: each is an object, not necessarily a \String.
+  # - Headers: each serves a key, and also need not be a \String.
+  #
+  # === Instance Methods
+  #
+  # \CSV::Row has three groups of instance methods:
+  # - Its own internally defined instance methods.
+  # - Methods included by module Enumerable.
+  # - Methods delegated to class Array.:
+  #   * Array#empty?
+  #   * Array#length
+  #   * Array#size
+  #
+  # == Creating a \CSV::Row Instance
+  #
+  # Commonly, a new \CSV::Row instance is created by parsing \CSV source
+  # that has headers:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.each {|row| p row }
+  # Output:
+  #   #<CSV::Row "Name":"foo" "Value":"0">
+  #   #<CSV::Row "Name":"bar" "Value":"1">
+  #   #<CSV::Row "Name":"baz" "Value":"2">
+  #
+  # You can also create a row directly. See ::new.
+  #
+  # == Headers
+  #
+  # Like a \CSV::Table, a \CSV::Row has headers.
+  #
+  # A \CSV::Row that was created by parsing \CSV source
+  # inherits its headers from the table:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   row = table.first
+  #   row.headers # => ["Name", "Value"]
+  #
+  # You can also create a new row with headers;
+  # like the keys in a \Hash, the headers need not be Strings:
+  #   row = CSV::Row.new([:name, :value], ['foo', 0])
+  #   row.headers # => [:name, :value]
+  #
+  # The new row retains its headers even if added to a table
+  # that has headers:
+  #   table << row # => #<CSV::Table mode:col_or_row row_count:5>
+  #   row.headers # => [:name, :value]
+  #   row[:name] # => "foo"
+  #   row['Name'] # => nil
+  #
+  #
+  #
+  # == Accessing Fields
+  #
+  # You may access a field in a \CSV::Row with either its \Integer index
+  # (\Array-style) or its header (\Hash-style).
+  #
+  # Fetch a field using method #[]:
+  #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
+  #   row[1] # => 0
+  #   row['Value'] # => 0
+  #
+  # Set a field using method #[]=:
+  #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
+  #   row # => #<CSV::Row "Name":"foo" "Value":0>
+  #   row[0] = 'bar'
+  #   row['Value'] = 1
+  #   row # => #<CSV::Row "Name":"bar" "Value":1>
+  #
+  class Row
+    # :call-seq:
+    #   CSV::Row.new(headers, fields, header_row = false) -> csv_row
+    #
+    # Returns the new \CSV::Row instance constructed from
+    # arguments +headers+ and +fields+; both should be Arrays;
+    # note that the fields need not be Strings:
+    #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
+    #   row # => #<CSV::Row "Name":"foo" "Value":0>
+    #
+    # If the \Array lengths are different, the shorter is +nil+-filled:
+    #   row = CSV::Row.new(['Name', 'Value', 'Date', 'Size'], ['foo', 0])
+    #   row # => #<CSV::Row "Name":"foo" "Value":0 "Date":nil "Size":nil>
+    #
+    # Each \CSV::Row object is either a <i>field row</i> or a <i>header row</i>;
+    # by default, a new row is a field row;  for the row created above:
+    #   row.field_row? # => true
+    #   row.header_row? # => false
+    #
+    # If the optional argument +header_row+ is given as +true+,
+    # the created row is a header row:
+    #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0], header_row = true)
+    #   row # => #<CSV::Row "Name":"foo" "Value":0>
+    #   row.field_row? # => false
+    #   row.header_row? # => true
+    def initialize(headers, fields, header_row = false)
+      @header_row = header_row
+      headers.each { |h| h.freeze if h.is_a? String }
+
+      # handle extra headers or fields
+      @row = if headers.size >= fields.size
+        headers.zip(fields)
+      else
+        fields.zip(headers).each(&:reverse!)
+      end
+    end
+
+    # Internal data format used to compare equality.
+    attr_reader :row
+    protected   :row
+
+    ### Array Delegation ###
+
+    extend Forwardable
+    def_delegators :@row, :empty?, :length, :size
+
+    # :call-seq:
+    #   row.initialize_copy(other_row) -> self
+    #
+    # Calls superclass method.
+    def initialize_copy(other)
+      super_return_value = super
+      @row = @row.collect(&:dup)
+      super_return_value
+    end
+
+    # :call-seq:
+    #   row.header_row? -> true or false
+    #
+    # Returns +true+ if this is a header row, +false+ otherwise.
+    def header_row?
+      @header_row
+    end
+
+    # :call-seq:
+    #   row.field_row? -> true or false
+    #
+    # Returns +true+ if this is a field row, +false+ otherwise.
+    def field_row?
+      not header_row?
+    end
+
+    # :call-seq:
+    #    row.headers -> array_of_headers
+    #
+    # Returns the headers for this row:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table.first
+    #   row.headers # => ["Name", "Value"]
+    def headers
+      @row.map(&:first)
+    end
+
+    # :call-seq:
+    #   field(index) -> value
+    #   field(header) -> value
+    #   field(header, offset) -> value
+    #
+    # Returns the field value for the given +index+ or +header+.
+    #
+    # ---
+    #
+    # Fetch field value by \Integer index:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.field(0) # => "foo"
+    #   row.field(1) # => "bar"
+    #
+    # Counts backward from the last column if +index+ is negative:
+    #   row.field(-1) # => "0"
+    #   row.field(-2) # => "foo"
+    #
+    # Returns +nil+ if +index+ is out of range:
+    #   row.field(2) # => nil
+    #   row.field(-3) # => nil
+    #
+    # ---
+    #
+    # Fetch field value by header (first found):
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.field('Name') # => "Foo"
+    #
+    # Fetch field value by header, ignoring +offset+ leading fields:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.field('Name', 2) # => "Baz"
+    #
+    # Returns +nil+ if the header does not exist.
+    def field(header_or_index, minimum_index = 0)
+      # locate the pair
+      finder = (header_or_index.is_a?(Integer) || header_or_index.is_a?(Range)) ? :[] : :assoc
+      pair   = @row[minimum_index..-1].public_send(finder, header_or_index)
+
+      # return the field if we have a pair
+      if pair.nil?
+        nil
+      else
+        header_or_index.is_a?(Range) ? pair.map(&:last) : pair.last
+      end
+    end
+    alias_method :[], :field
+
+    #
+    # :call-seq:
+    #   fetch(header) -> value
+    #   fetch(header, default) -> value
+    #   fetch(header) {|row| ... } -> value
+    #
+    # Returns the field value as specified by +header+.
+    #
+    # ---
+    #
+    # With the single argument +header+, returns the field value
+    # for that header (first found):
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.fetch('Name') # => "Foo"
+    #
+    # Raises exception +KeyError+ if the header does not exist.
+    #
+    # ---
+    #
+    # With arguments +header+ and +default+ given,
+    # returns the field value for the header (first found)
+    # if the header exists, otherwise returns +default+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.fetch('Name', '') # => "Foo"
+    #   row.fetch(:nosuch, '') # => ""
+    #
+    # ---
+    #
+    # With argument +header+ and a block given,
+    # returns the field value for the header (first found)
+    # if the header exists; otherwise calls the block
+    # and returns its return value:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.fetch('Name') {|header| fail 'Cannot happen' } # => "Foo"
+    #   row.fetch(:nosuch) {|header| "Header '#{header} not found'" } # => "Header 'nosuch not found'"
+    def fetch(header, *varargs)
+      raise ArgumentError, "Too many arguments" if varargs.length > 1
+      pair = @row.assoc(header)
+      if pair
+        pair.last
+      else
+        if block_given?
+          yield header
+        elsif varargs.empty?
+          raise KeyError, "key not found: #{header}"
+        else
+          varargs.first
+        end
+      end
+    end
+
+    # :call-seq:
+    #   row.has_key?(header) -> true or false
+    #
+    # Returns +true+ if there is a field with the given +header+,
+    # +false+ otherwise.
+    def has_key?(header)
+      !!@row.assoc(header)
+    end
+    alias_method :include?, :has_key?
+    alias_method :key?,     :has_key?
+    alias_method :member?,  :has_key?
+    alias_method :header?,  :has_key?
+
+    #
+    # :call-seq:
+    #   row[index] = value -> value
+    #   row[header, offset] = value -> value
+    #   row[header] = value -> value
+    #
+    # Assigns the field value for the given +index+ or +header+;
+    # returns +value+.
+    #
+    # ---
+    #
+    # Assign field value by \Integer index:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row[0] = 'Bat'
+    #   row[1] = 3
+    #   row # => #<CSV::Row "Name":"Bat" "Value":3>
+    #
+    # Counts backward from the last column if +index+ is negative:
+    #   row[-1] = 4
+    #   row[-2] = 'Bam'
+    #   row # => #<CSV::Row "Name":"Bam" "Value":4>
+    #
+    # Extends the row with <tt>nil:nil</tt> if positive +index+ is not in the row:
+    #   row[4] = 5
+    #   row # => #<CSV::Row "Name":"bad" "Value":4 nil:nil nil:nil nil:5>
+    #
+    # Raises IndexError if negative +index+ is too small (too far from zero).
+    #
+    # ---
+    #
+    # Assign field value by header (first found):
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row['Name'] = 'Bat'
+    #   row # => #<CSV::Row "Name":"Bat" "Name":"Bar" "Name":"Baz">
+    #
+    # Assign field value by header, ignoring +offset+ leading fields:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row['Name', 2] = 4
+    #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":4>
+    #
+    # Append new field by (new) header:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row['New'] = 6
+    #   row# => #<CSV::Row "Name":"foo" "Value":"0" "New":6>
+    def []=(*args)
+      value = args.pop
+
+      if args.first.is_a? Integer
+        if @row[args.first].nil?  # extending past the end with index
+          @row[args.first] = [nil, value]
+          @row.map! { |pair| pair.nil? ? [nil, nil] : pair }
+        else                      # normal index assignment
+          @row[args.first][1] = value
+        end
+      else
+        index = index(*args)
+        if index.nil?             # appending a field
+          self << [args.first, value]
+        else                      # normal header assignment
+          @row[index][1] = value
+        end
+      end
+    end
+
+    #
+    # :call-seq:
+    #   row << [header, value] -> self
+    #   row << hash -> self
+    #   row << value -> self
+    #
+    # Adds a field to +self+; returns +self+:
+    #
+    # If the argument is a 2-element \Array <tt>[header, value]</tt>,
+    # a field is added with the given +header+ and +value+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row << ['NAME', 'Bat']
+    #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" "NAME":"Bat">
+    #
+    # If the argument is a \Hash, each <tt>key-value</tt> pair is added
+    # as a field with header +key+ and value +value+.
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row << {NAME: 'Bat', name: 'Bam'}
+    #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" NAME:"Bat" name:"Bam">
+    #
+    # Otherwise, the given +value+ is added as a field with no header.
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row << 'Bag'
+    #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bag">
+    def <<(arg)
+      if arg.is_a?(Array) and arg.size == 2  # appending a header and name
+        @row << arg
+      elsif arg.is_a?(Hash)                  # append header and name pairs
+        arg.each { |pair| @row << pair }
+      else                                   # append field value
+        @row << [nil, arg]
+      end
+
+      self  # for chaining
+    end
+
+    # :call-seq:
+    #   row.push(*values) -> self
+    #
+    # Appends each of the given +values+ to +self+ as a field; returns +self+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.push('Bat', 'Bam')
+    #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bat" nil:"Bam">
+    def push(*args)
+      args.each { |arg| self << arg }
+
+      self  # for chaining
+    end
+
+    #
+    # :call-seq:
+    #   delete(index) -> [header, value] or nil
+    #   delete(header) -> [header, value] or empty_array
+    #   delete(header, offset) -> [header, value] or empty_array
+    #
+    # Removes a specified field from +self+; returns the 2-element \Array
+    # <tt>[header, value]</tt> if the field exists.
+    #
+    # If an \Integer argument +index+ is given,
+    # removes and returns the field at offset +index+,
+    # or returns +nil+ if the field does not exist:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.delete(1) # => ["Name", "Bar"]
+    #   row.delete(50) # => nil
+    #
+    # Otherwise, if the single argument +header+ is given,
+    # removes and returns the first-found field with the given header,
+    # of returns a new empty \Array if the field does not exist:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.delete('Name') # => ["Name", "Foo"]
+    #   row.delete('NAME') # => []
+    #
+    # If argument +header+ and \Integer argument +offset+ are given,
+    # removes and returns the first-found field with the given header
+    # whose +index+ is at least as large as +offset+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.delete('Name', 1) # => ["Name", "Bar"]
+    #   row.delete('NAME', 1) # => []
+    def delete(header_or_index, minimum_index = 0)
+      if header_or_index.is_a? Integer                 # by index
+        @row.delete_at(header_or_index)
+      elsif i = index(header_or_index, minimum_index)  # by header
+        @row.delete_at(i)
+      else
+        [ ]
+      end
+    end
+
+    # :call-seq:
+    #   row.delete_if {|header, value| ... } -> self
+    #
+    # Removes fields from +self+ as selected by the block; returns +self+.
+    #
+    # Removes each field for which the block returns a truthy value:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.delete_if {|header, value| value.start_with?('B') } # => true
+    #   row # => #<CSV::Row "Name":"Foo">
+    #   row.delete_if {|header, value| header.start_with?('B') } # => false
+    #
+    # If no block is given, returns a new Enumerator:
+    #   row.delete_if # => #<Enumerator: #<CSV::Row "Name":"Foo">:delete_if>
+    def delete_if(&block)
+      return enum_for(__method__) { size } unless block_given?
+
+      @row.delete_if(&block)
+
+      self  # for chaining
+    end
+
+    # :call-seq:
+    #   self.fields(*specifiers) -> array_of_fields
+    #
+    # Returns field values per the given +specifiers+, which may be any mixture of:
+    # - \Integer index.
+    # - \Range of \Integer indexes.
+    # - 2-element \Array containing a header and offset.
+    # - Header.
+    # - \Range of headers.
+    #
+    # For +specifier+ in one of the first four cases above,
+    # returns the result of <tt>self.field(specifier)</tt>;  see #field.
+    #
+    # Although there may be any number of +specifiers+,
+    # the examples here will illustrate one at a time.
+    #
+    # When the specifier is an \Integer +index+,
+    # returns <tt>self.field(index)</tt>L
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.fields(1) # => ["Bar"]
+    #
+    # When the specifier is a \Range of \Integers +range+,
+    # returns <tt>self.field(range)</tt>:
+    #   row.fields(1..2) # => ["Bar", "Baz"]
+    #
+    # When the specifier is a 2-element \Array +array+,
+    # returns <tt>self.field(array)</tt>L
+    #   row.fields('Name', 1) # => ["Foo", "Bar"]
+    #
+    # When the specifier is a header +header+,
+    # returns <tt>self.field(header)</tt>L
+    #   row.fields('Name') # => ["Foo"]
+    #
+    # When the specifier is a \Range of headers +range+,
+    # forms a new \Range +new_range+ from the indexes of
+    # <tt>range.start</tt> and <tt>range.end</tt>,
+    # and returns <tt>self.field(new_range)</tt>:
+    #   source = "Name,NAME,name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.fields('Name'..'NAME') # => ["Foo", "Bar"]
+    #
+    # Returns all fields if no argument given:
+    #   row.fields # => ["Foo", "Bar", "Baz"]
+    def fields(*headers_and_or_indices)
+      if headers_and_or_indices.empty?  # return all fields--no arguments
+        @row.map(&:last)
+      else                              # or work like values_at()
+        all = []
+        headers_and_or_indices.each do |h_or_i|
+          if h_or_i.is_a? Range
+            index_begin = h_or_i.begin.is_a?(Integer) ? h_or_i.begin :
+                                                        index(h_or_i.begin)
+            index_end   = h_or_i.end.is_a?(Integer)   ? h_or_i.end :
+                                                        index(h_or_i.end)
+            new_range   = h_or_i.exclude_end? ? (index_begin...index_end) :
+                                                (index_begin..index_end)
+            all.concat(fields.values_at(new_range))
+          else
+            all << field(*Array(h_or_i))
+          end
+        end
+        return all
+      end
+    end
+    alias_method :values_at, :fields
+
+    # :call-seq:
+    #   index(header) -> index
+    #   index(header, offset) -> index
+    #
+    # Returns the index for the given header, if it exists;
+    # otherwise returns +nil+.
+    #
+    # With the single argument +header+, returns the index
+    # of the first-found field with the given +header+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.index('Name') # => 0
+    #   row.index('NAME') # => nil
+    #
+    # With arguments +header+ and +offset+,
+    # returns the index of the first-found field with given +header+,
+    # but ignoring the first +offset+ fields:
+    #   row.index('Name', 1) # => 1
+    #   row.index('Name', 3) # => nil
+    def index(header, minimum_index = 0)
+      # find the pair
+      index = headers[minimum_index..-1].index(header)
+      # return the index at the right offset, if we found one
+      index.nil? ? nil : index + minimum_index
+    end
+
+    # :call-seq:
+    #   row.field?(value) -> true or false
+    #
+    # Returns +true+ if +value+ is a field in this row, +false+ otherwise:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.field?('Bar') # => true
+    #   row.field?('BAR') # => false
+    def field?(data)
+      fields.include? data
+    end
+
+    include Enumerable
+
+    # :call-seq:
+    #   row.each {|header, value| ... } -> self
+    #
+    # Calls the block with each header-value pair; returns +self+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.each {|header, value| p [header, value] }
+    # Output:
+    #   ["Name", "Foo"]
+    #   ["Name", "Bar"]
+    #   ["Name", "Baz"]
+    #
+    # If no block is given, returns a new Enumerator:
+    #   row.each # => #<Enumerator: #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz">:each>
+    def each(&block)
+      return enum_for(__method__) { size } unless block_given?
+
+      @row.each(&block)
+
+      self  # for chaining
+    end
+
+    alias_method :each_pair, :each
+
+    # :call-seq:
+    #   row == other -> true or false
+    #
+    # Returns +true+ if +other+ is a /CSV::Row that has the same
+    # fields (headers and values) in the same order as +self+;
+    # otherwise returns +false+:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   other_row = table[0]
+    #   row == other_row # => true
+    #   other_row = table[1]
+    #   row == other_row # => false
+    def ==(other)
+      return @row == other.row if other.is_a? CSV::Row
+      @row == other
+    end
+
+    # :call-seq:
+    #   row.to_h -> hash
+    #
+    # Returns the new \Hash formed by adding each header-value pair in +self+
+    # as a key-value pair in the \Hash.
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.to_h # => {"Name"=>"foo", "Value"=>"0"}
+    #
+    # Header order is preserved, but repeated headers are ignored:
+    #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.to_h # => {"Name"=>"Foo"}
+    def to_h
+      hash = {}
+      each do |key, _value|
+        hash[key] = self[key] unless hash.key?(key)
+      end
+      hash
+    end
+    alias_method :to_hash, :to_h
+
+    # :call-seq:
+    #   row.deconstruct_keys(keys) -> hash
+    #
+    # Returns the new \Hash suitable for pattern matching containing only the
+    # keys specified as an argument.
+    def deconstruct_keys(keys)
+      if keys.nil?
+        to_h
+      else
+        keys.to_h { |key| [key, self[key]] }
+      end
+    end
+
+    alias_method :to_ary, :to_a
+
+    # :call-seq:
+    #   row.deconstruct -> array
+    #
+    # Returns the new \Array suitable for pattern matching containing the values
+    # of the row.
+    def deconstruct
+      fields
+    end
+
+    # :call-seq:
+    #   row.to_csv -> csv_string
+    #
+    # Returns the row as a \CSV String. Headers are not included:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.to_csv # => "foo,0\n"
+    def to_csv(**options)
+      fields.to_csv(**options)
+    end
+    alias_method :to_s, :to_csv
+
+    # :call-seq:
+    #   row.dig(index_or_header, *identifiers) -> object
+    #
+    # Finds and returns the object in nested object that is specified
+    # by +index_or_header+ and +specifiers+.
+    #
+    # The nested objects may be instances of various classes.
+    # See {Dig Methods}[rdoc-ref:dig_methods.rdoc].
+    #
+    # Examples:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.dig(1) # => "0"
+    #   row.dig('Value') # => "0"
+    #   row.dig(5) # => nil
+    def dig(index_or_header, *indexes)
+      value = field(index_or_header)
+      if value.nil?
+        nil
+      elsif indexes.empty?
+        value
+      else
+        unless value.respond_to?(:dig)
+          raise TypeError, "#{value.class} does not have \#dig method"
+        end
+        value.dig(*indexes)
+      end
+    end
+
+    # :call-seq:
+    #   row.inspect -> string
+    #
+    # Returns an ASCII-compatible \String showing:
+    # - Class \CSV::Row.
+    # - Header-value pairs.
+    # Example:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   row = table[0]
+    #   row.inspect # => "#<CSV::Row \"Name\":\"foo\" \"Value\":\"0\">"
+    def inspect
+      str = ["#<", self.class.to_s]
+      each do |header, field|
+        str << " " << (header.is_a?(Symbol) ? header.to_s : header.inspect) <<
+               ":" << field.inspect
+      end
+      str << ">"
+      begin
+        str.join('')
+      rescue  # any encoding error
+        str.map do |s|
+          e = Encoding::Converter.asciicompat_encoding(s.encoding)
+          e ? s.encode(e) : s.force_encoding("ASCII-8BIT")
+        end.join('')
+      end
+    end
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/table.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/table.rb
new file mode 100644
index 0000000..fb19f54
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/table.rb
@@ -0,0 +1,1055 @@
+# frozen_string_literal: true
+
+require "forwardable"
+
+class CSV
+  # = \CSV::Table
+  # A \CSV::Table instance represents \CSV data.
+  # (see {class CSV}[../CSV.html]).
+  #
+  # The instance may have:
+  # - Rows: each is a Table::Row object.
+  # - Headers: names for the columns.
+  #
+  # === Instance Methods
+  #
+  # \CSV::Table has three groups of instance methods:
+  # - Its own internally defined instance methods.
+  # - Methods included by module Enumerable.
+  # - Methods delegated to class Array.:
+  #   * Array#empty?
+  #   * Array#length
+  #   * Array#size
+  #
+  # == Creating a \CSV::Table Instance
+  #
+  # Commonly, a new \CSV::Table instance is created by parsing \CSV source
+  # using headers:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.class # => CSV::Table
+  #
+  # You can also create an instance directly. See ::new.
+  #
+  # == Headers
+  #
+  # If a table has headers, the headers serve as labels for the columns of data.
+  # Each header serves as the label for its column.
+  #
+  # The headers for a \CSV::Table object are stored as an \Array of Strings.
+  #
+  # Commonly, headers are defined in the first row of \CSV source:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.headers # => ["Name", "Value"]
+  #
+  # If no headers are defined, the \Array is empty:
+  #   table = CSV::Table.new([])
+  #   table.headers # => []
+  #
+  # == Access Modes
+  #
+  # \CSV::Table provides three modes for accessing table data:
+  # - \Row mode.
+  # - Column mode.
+  # - Mixed mode (the default for a new table).
+  #
+  # The access mode for a\CSV::Table instance affects the behavior
+  # of some of its instance methods:
+  # - #[]
+  # - #[]=
+  # - #delete
+  # - #delete_if
+  # - #each
+  # - #values_at
+  #
+  # === \Row Mode
+  #
+  # Set a table to row mode with method #by_row!:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+  #
+  # Specify a single row by an \Integer index:
+  #   # Get a row.
+  #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
+  #   # Set a row, then get it.
+  #   table[1] = CSV::Row.new(['Name', 'Value'], ['bam', 3])
+  #   table[1] # => #<CSV::Row "Name":"bam" "Value":3>
+  #
+  # Specify a sequence of rows by a \Range:
+  #   # Get rows.
+  #   table[1..2] # => [#<CSV::Row "Name":"bam" "Value":3>, #<CSV::Row "Name":"baz" "Value":"2">]
+  #   # Set rows, then get them.
+  #   table[1..2] = [
+  #     CSV::Row.new(['Name', 'Value'], ['bat', 4]),
+  #     CSV::Row.new(['Name', 'Value'], ['bad', 5]),
+  #   ]
+  #   table[1..2] # => [["Name", #<CSV::Row "Name":"bat" "Value":4>], ["Value", #<CSV::Row "Name":"bad" "Value":5>]]
+  #
+  # === Column Mode
+  #
+  # Set a table to column mode with method #by_col!:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+  #
+  # Specify a column by an \Integer index:
+  #   # Get a column.
+  #   table[0]
+  #   # Set a column, then get it.
+  #   table[0] = ['FOO', 'BAR', 'BAZ']
+  #   table[0] # => ["FOO", "BAR", "BAZ"]
+  #
+  # Specify a column by its \String header:
+  #   # Get a column.
+  #   table['Name'] # => ["FOO", "BAR", "BAZ"]
+  #   # Set a column, then get it.
+  #   table['Name'] = ['Foo', 'Bar', 'Baz']
+  #   table['Name'] # => ["Foo", "Bar", "Baz"]
+  #
+  # === Mixed Mode
+  #
+  # In mixed mode, you can refer to either rows or columns:
+  # - An \Integer index refers to a row.
+  # - A \Range index refers to multiple rows.
+  # - A \String index refers to a column.
+  #
+  # Set a table to mixed mode with method #by_col_or_row!:
+  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+  #   table = CSV.parse(source, headers: true)
+  #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
+  #
+  # Specify a single row by an \Integer index:
+  #   # Get a row.
+  #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
+  #   # Set a row, then get it.
+  #   table[1] = CSV::Row.new(['Name', 'Value'], ['bam', 3])
+  #   table[1] # => #<CSV::Row "Name":"bam" "Value":3>
+  #
+  # Specify a sequence of rows by a \Range:
+  #   # Get rows.
+  #   table[1..2] # => [#<CSV::Row "Name":"bam" "Value":3>, #<CSV::Row "Name":"baz" "Value":"2">]
+  #   # Set rows, then get them.
+  #   table[1] = CSV::Row.new(['Name', 'Value'], ['bat', 4])
+  #   table[2] = CSV::Row.new(['Name', 'Value'], ['bad', 5])
+  #   table[1..2] # => [["Name", #<CSV::Row "Name":"bat" "Value":4>], ["Value", #<CSV::Row "Name":"bad" "Value":5>]]
+  #
+  # Specify a column by its \String header:
+  #   # Get a column.
+  #   table['Name'] # => ["foo", "bat", "bad"]
+  #   # Set a column, then get it.
+  #   table['Name'] = ['Foo', 'Bar', 'Baz']
+  #   table['Name'] # => ["Foo", "Bar", "Baz"]
+  class Table
+    # :call-seq:
+    #   CSV::Table.new(array_of_rows, headers = nil) -> csv_table
+    #
+    # Returns a new \CSV::Table object.
+    #
+    # - Argument +array_of_rows+ must be an \Array of CSV::Row objects.
+    # - Argument +headers+, if given, may be an \Array of Strings.
+    #
+    # ---
+    #
+    # Create an empty \CSV::Table object:
+    #   table = CSV::Table.new([])
+    #   table # => #<CSV::Table mode:col_or_row row_count:1>
+    #
+    # Create a non-empty \CSV::Table object:
+    #   rows = [
+    #     CSV::Row.new([], []),
+    #     CSV::Row.new([], []),
+    #     CSV::Row.new([], []),
+    #   ]
+    #   table  = CSV::Table.new(rows)
+    #   table # => #<CSV::Table mode:col_or_row row_count:4>
+    #
+    # ---
+    #
+    # If argument +headers+ is an \Array of Strings,
+    # those Strings become the table's headers:
+    #   table = CSV::Table.new([], headers: ['Name', 'Age'])
+    #   table.headers # => ["Name", "Age"]
+    #
+    # If argument +headers+ is not given and the table has rows,
+    # the headers are taken from the first row:
+    #   rows = [
+    #     CSV::Row.new(['Foo', 'Bar'], []),
+    #     CSV::Row.new(['foo', 'bar'], []),
+    #     CSV::Row.new(['FOO', 'BAR'], []),
+    #   ]
+    #   table  = CSV::Table.new(rows)
+    #   table.headers # => ["Foo", "Bar"]
+    #
+    # If argument +headers+ is not given and the table is empty (has no rows),
+    # the headers are also empty:
+    #   table  = CSV::Table.new([])
+    #   table.headers # => []
+    #
+    # ---
+    #
+    # Raises an exception if argument +array_of_rows+ is not an \Array object:
+    #   # Raises NoMethodError (undefined method `first' for :foo:Symbol):
+    #   CSV::Table.new(:foo)
+    #
+    # Raises an exception if an element of +array_of_rows+ is not a \CSV::Table object:
+    #   # Raises NoMethodError (undefined method `headers' for :foo:Symbol):
+    #   CSV::Table.new([:foo])
+    def initialize(array_of_rows, headers: nil)
+      @table = array_of_rows
+      @headers = headers
+      unless @headers
+        if @table.empty?
+          @headers = []
+        else
+          @headers = @table.first.headers
+        end
+      end
+
+      @mode  = :col_or_row
+    end
+
+    # The current access mode for indexing and iteration.
+    attr_reader :mode
+
+    # Internal data format used to compare equality.
+    attr_reader :table
+    protected   :table
+
+    ### Array Delegation ###
+
+    extend Forwardable
+    def_delegators :@table, :empty?, :length, :size
+
+    # :call-seq:
+    #   table.by_col -> table_dup
+    #
+    # Returns a duplicate of +self+, in column mode
+    # (see {Column Mode}[#class-CSV::Table-label-Column+Mode]):
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.mode # => :col_or_row
+    #   dup_table = table.by_col
+    #   dup_table.mode # => :col
+    #   dup_table.equal?(table) # => false # It's a dup
+    #
+    # This may be used to chain method calls without changing the mode
+    # (but also will affect performance and memory usage):
+    #   dup_table.by_col['Name']
+    #
+    # Also note that changes to the duplicate table will not affect the original.
+    def by_col
+      self.class.new(@table.dup).by_col!
+    end
+
+    # :call-seq:
+    #   table.by_col! -> self
+    #
+    # Sets the mode for +self+ to column mode
+    # (see {Column Mode}[#class-CSV::Table-label-Column+Mode]); returns +self+:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.mode # => :col_or_row
+    #   table1 = table.by_col!
+    #   table.mode # => :col
+    #   table1.equal?(table) # => true # Returned self
+    def by_col!
+      @mode = :col
+
+      self
+    end
+
+    # :call-seq:
+    #   table.by_col_or_row -> table_dup
+    #
+    # Returns a duplicate of +self+, in mixed mode
+    # (see {Mixed Mode}[#class-CSV::Table-label-Mixed+Mode]):
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true).by_col!
+    #   table.mode # => :col
+    #   dup_table = table.by_col_or_row
+    #   dup_table.mode # => :col_or_row
+    #   dup_table.equal?(table) # => false # It's a dup
+    #
+    # This may be used to chain method calls without changing the mode
+    # (but also will affect performance and memory usage):
+    #   dup_table.by_col_or_row['Name']
+    #
+    # Also note that changes to the duplicate table will not affect the original.
+    def by_col_or_row
+      self.class.new(@table.dup).by_col_or_row!
+    end
+
+    # :call-seq:
+    #   table.by_col_or_row! -> self
+    #
+    # Sets the mode for +self+ to mixed mode
+    # (see {Mixed Mode}[#class-CSV::Table-label-Mixed+Mode]); returns +self+:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true).by_col!
+    #   table.mode # => :col
+    #   table1 = table.by_col_or_row!
+    #   table.mode # => :col_or_row
+    #   table1.equal?(table) # => true # Returned self
+    def by_col_or_row!
+      @mode = :col_or_row
+
+      self
+    end
+
+    # :call-seq:
+    #   table.by_row -> table_dup
+    #
+    # Returns a duplicate of +self+, in row mode
+    # (see {Row Mode}[#class-CSV::Table-label-Row+Mode]):
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.mode # => :col_or_row
+    #   dup_table = table.by_row
+    #   dup_table.mode # => :row
+    #   dup_table.equal?(table) # => false # It's a dup
+    #
+    # This may be used to chain method calls without changing the mode
+    # (but also will affect performance and memory usage):
+    #   dup_table.by_row[1]
+    #
+    # Also note that changes to the duplicate table will not affect the original.
+    def by_row
+      self.class.new(@table.dup).by_row!
+    end
+
+    # :call-seq:
+    #   table.by_row! -> self
+    #
+    # Sets the mode for +self+ to row mode
+    # (see {Row Mode}[#class-CSV::Table-label-Row+Mode]); returns +self+:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.mode # => :col_or_row
+    #   table1 = table.by_row!
+    #   table.mode # => :row
+    #   table1.equal?(table) # => true # Returned self
+    def by_row!
+      @mode = :row
+
+      self
+    end
+
+    # :call-seq:
+    #   table.headers -> array_of_headers
+    #
+    # Returns a new \Array containing the \String headers for the table.
+    #
+    # If the table is not empty, returns the headers from the first row:
+    #   rows = [
+    #     CSV::Row.new(['Foo', 'Bar'], []),
+    #     CSV::Row.new(['FOO', 'BAR'], []),
+    #     CSV::Row.new(['foo', 'bar'], []),
+    #   ]
+    #   table  = CSV::Table.new(rows)
+    #   table.headers # => ["Foo", "Bar"]
+    #   table.delete(0)
+    #   table.headers # => ["FOO", "BAR"]
+    #   table.delete(0)
+    #   table.headers # => ["foo", "bar"]
+    #
+    # If the table is empty, returns a copy of the headers in the table itself:
+    #   table.delete(0)
+    #   table.headers # => ["Foo", "Bar"]
+    def headers
+      if @table.empty?
+        @headers.dup
+      else
+        @table.first.headers
+      end
+    end
+
+    # :call-seq:
+    #   table[n] -> row or column_data
+    #   table[range] -> array_of_rows or array_of_column_data
+    #   table[header] -> array_of_column_data
+    #
+    # Returns data from the table;  does not modify the table.
+    #
+    # ---
+    #
+    # Fetch a \Row by Its \Integer Index::
+    # - Form: <tt>table[n]</tt>, +n+ an integer.
+    # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
+    # - Return value: _nth_ row of the table, if that row exists;
+    #   otherwise +nil+.
+    #
+    # Returns the _nth_ row of the table if that row exists:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
+    #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
+    #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
+    #
+    # Counts backward from the last row if +n+ is negative:
+    #   table[-1] # => #<CSV::Row "Name":"baz" "Value":"2">
+    #
+    # Returns +nil+ if +n+ is too large or too small:
+    #   table[4] # => nil
+    #   table[-4] # => nil
+    #
+    # Raises an exception if the access mode is <tt>:row</tt>
+    # and +n+ is not an \Integer:
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   # Raises TypeError (no implicit conversion of String into Integer):
+    #   table['Name']
+    #
+    # ---
+    #
+    # Fetch a Column by Its \Integer Index::
+    # - Form: <tt>table[n]</tt>, +n+ an \Integer.
+    # - Access mode: <tt>:col</tt>.
+    # - Return value: _nth_ column of the table, if that column exists;
+    #   otherwise an \Array of +nil+ fields of length <tt>self.size</tt>.
+    #
+    # Returns the _nth_ column of the table if that column exists:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   table[1] # => ["0", "1", "2"]
+    #
+    # Counts backward from the last column if +n+ is negative:
+    #   table[-2] # => ["foo", "bar", "baz"]
+    #
+    # Returns an \Array of +nil+ fields if +n+ is too large or too small:
+    #   table[4] # => [nil, nil, nil]
+    #   table[-4] # => [nil, nil, nil]
+    #
+    # ---
+    #
+    # Fetch Rows by \Range::
+    # - Form: <tt>table[range]</tt>, +range+ a \Range object.
+    # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
+    # - Return value: rows from the table, beginning at row <tt>range.start</tt>,
+    #   if those rows exists.
+    #
+    # Returns rows from the table, beginning at row <tt>range.first</tt>,
+    # if those rows exist:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   rows = table[1..2] # => #<CSV::Row "Name":"bar" "Value":"1">
+    #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
+    #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
+    #   rows = table[1..2] # => #<CSV::Row "Name":"bar" "Value":"1">
+    #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # If there are too few rows, returns all from <tt>range.start</tt> to the end:
+    #   rows = table[1..50] # => #<CSV::Row "Name":"bar" "Value":"1">
+    #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # Special case: if <tt>range.start == table.size</tt>, returns an empty \Array:
+    #   table[table.size..50] # => []
+    #
+    # If <tt>range.end</tt> is negative, calculates the ending index from the end:
+    #   rows = table[0..-1]
+    #   rows # => [#<CSV::Row "Name":"foo" "Value":"0">, #<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # If <tt>range.start</tt> is negative, calculates the starting index from the end:
+    #   rows = table[-1..2]
+    #   rows # => [#<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # If <tt>range.start</tt> is larger than <tt>table.size</tt>, returns +nil+:
+    #   table[4..4] # => nil
+    #
+    # ---
+    #
+    # Fetch Columns by \Range::
+    # - Form: <tt>table[range]</tt>, +range+ a \Range object.
+    # - Access mode: <tt>:col</tt>.
+    # - Return value: column data from the table, beginning at column <tt>range.start</tt>,
+    #   if those columns exist.
+    #
+    # Returns column values from the table, if the column exists;
+    # the values are arranged by row:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_col!
+    #   table[0..1] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # Special case: if <tt>range.start == headers.size</tt>,
+    # returns an \Array (size: <tt>table.size</tt>) of empty \Arrays:
+    #   table[table.headers.size..50] # => [[], [], []]
+    #
+    # If <tt>range.end</tt> is negative, calculates the ending index from the end:
+    #   table[0..-1] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # If <tt>range.start</tt> is negative, calculates the starting index from the end:
+    #   table[-2..2] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    #
+    # If <tt>range.start</tt> is larger than <tt>table.size</tt>,
+    # returns an \Array of +nil+ values:
+    #   table[4..4] # => [nil, nil, nil]
+    #
+    # ---
+    #
+    # Fetch a Column by Its \String Header::
+    # - Form: <tt>table[header]</tt>, +header+ a \String header.
+    # - Access mode: <tt>:col</tt> or <tt>:col_or_row</tt>
+    # - Return value: column data from the table, if that +header+ exists.
+    #
+    # Returns column values from the table, if the column exists:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   table['Name'] # => ["foo", "bar", "baz"]
+    #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
+    #   col = table['Name']
+    #   col # => ["foo", "bar", "baz"]
+    #
+    # Modifying the returned column values does not modify the table:
+    #   col[0] = 'bat'
+    #   col # => ["bat", "bar", "baz"]
+    #   table['Name'] # => ["foo", "bar", "baz"]
+    #
+    # Returns an \Array of +nil+ values if there is no such column:
+    #   table['Nosuch'] # => [nil, nil, nil]
+    def [](index_or_header)
+      if @mode == :row or  # by index
+         (@mode == :col_or_row and (index_or_header.is_a?(Integer) or index_or_header.is_a?(Range)))
+        @table[index_or_header]
+      else                 # by header
+        @table.map { |row| row[index_or_header] }
+      end
+    end
+
+    # :call-seq:
+    #   table[n] = row -> row
+    #   table[n] = field_or_array_of_fields -> field_or_array_of_fields
+    #   table[header] = field_or_array_of_fields -> field_or_array_of_fields
+    #
+    # Puts data onto the table.
+    #
+    # ---
+    #
+    # Set a \Row by Its \Integer Index::
+    # - Form: <tt>table[n] = row</tt>, +n+ an \Integer,
+    #   +row+ a \CSV::Row instance or an \Array of fields.
+    # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
+    # - Return value: +row+.
+    #
+    # If the row exists, it is replaced:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   new_row = CSV::Row.new(['Name', 'Value'], ['bat', 3])
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   return_value = table[0] = new_row
+    #   return_value.equal?(new_row) # => true # Returned the row
+    #   table[0].to_h # => {"Name"=>"bat", "Value"=>3}
+    #
+    # With access mode <tt>:col_or_row</tt>:
+    #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
+    #   table[0] = CSV::Row.new(['Name', 'Value'], ['bam', 4])
+    #   table[0].to_h # => {"Name"=>"bam", "Value"=>4}
+    #
+    # With an \Array instead of a \CSV::Row, inherits headers from the table:
+    #   array = ['bad', 5]
+    #   return_value = table[0] = array
+    #   return_value.equal?(array) # => true # Returned the array
+    #   table[0].to_h # => {"Name"=>"bad", "Value"=>5}
+    #
+    # If the row does not exist, extends the table by adding rows:
+    # assigns rows with +nil+ as needed:
+    #   table.size # => 3
+    #   table[5] = ['bag', 6]
+    #   table.size # => 6
+    #   table[3] # => nil
+    #   table[4]# => nil
+    #   table[5].to_h # => {"Name"=>"bag", "Value"=>6}
+    #
+    # Note that the +nil+ rows are actually +nil+, not a row of +nil+ fields.
+    #
+    # ---
+    #
+    # Set a Column by Its \Integer Index::
+    # - Form: <tt>table[n] = array_of_fields</tt>, +n+ an \Integer,
+    #   +array_of_fields+ an \Array of \String fields.
+    # - Access mode: <tt>:col</tt>.
+    # - Return value: +array_of_fields+.
+    #
+    # If the column exists, it is replaced:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   new_col = [3, 4, 5]
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   return_value = table[1] = new_col
+    #   return_value.equal?(new_col) # => true # Returned the column
+    #   table[1] # => [3, 4, 5]
+    #   # The rows, as revised:
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   table[0].to_h # => {"Name"=>"foo", "Value"=>3}
+    #   table[1].to_h # => {"Name"=>"bar", "Value"=>4}
+    #   table[2].to_h # => {"Name"=>"baz", "Value"=>5}
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #
+    # If there are too few values, fills with +nil+ values:
+    #   table[1] = [0]
+    #   table[1] # => [0, nil, nil]
+    #
+    # If there are too many values, ignores the extra values:
+    #   table[1] = [0, 1, 2, 3, 4]
+    #   table[1] # => [0, 1, 2]
+    #
+    # If a single value is given, replaces all fields in the column with that value:
+    #   table[1] = 'bat'
+    #   table[1] # => ["bat", "bat", "bat"]
+    #
+    # ---
+    #
+    # Set a Column by Its \String Header::
+    # - Form: <tt>table[header] = field_or_array_of_fields</tt>,
+    #   +header+ a \String header, +field_or_array_of_fields+ a field value
+    #   or an \Array of \String fields.
+    # - Access mode: <tt>:col</tt> or <tt>:col_or_row</tt>.
+    # - Return value: +field_or_array_of_fields+.
+    #
+    # If the column exists, it is replaced:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   new_col = [3, 4, 5]
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   return_value = table['Value'] = new_col
+    #   return_value.equal?(new_col) # => true # Returned the column
+    #   table['Value'] # => [3, 4, 5]
+    #   # The rows, as revised:
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   table[0].to_h # => {"Name"=>"foo", "Value"=>3}
+    #   table[1].to_h # => {"Name"=>"bar", "Value"=>4}
+    #   table[2].to_h # => {"Name"=>"baz", "Value"=>5}
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #
+    # If there are too few values, fills with +nil+ values:
+    #   table['Value'] = [0]
+    #   table['Value'] # => [0, nil, nil]
+    #
+    # If there are too many values, ignores the extra values:
+    #   table['Value'] = [0, 1, 2, 3, 4]
+    #   table['Value'] # => [0, 1, 2]
+    #
+    # If the column does not exist, extends the table by adding columns:
+    #   table['Note'] = ['x', 'y', 'z']
+    #   table['Note'] # => ["x", "y", "z"]
+    #   # The rows, as revised:
+    #   table.by_row!
+    #   table[0].to_h # => {"Name"=>"foo", "Value"=>0, "Note"=>"x"}
+    #   table[1].to_h # => {"Name"=>"bar", "Value"=>1, "Note"=>"y"}
+    #   table[2].to_h # => {"Name"=>"baz", "Value"=>2, "Note"=>"z"}
+    #   table.by_col!
+    #
+    # If a single value is given, replaces all fields in the column with that value:
+    #   table['Value'] = 'bat'
+    #   table['Value'] # => ["bat", "bat", "bat"]
+    def []=(index_or_header, value)
+      if @mode == :row or  # by index
+         (@mode == :col_or_row and index_or_header.is_a? Integer)
+        if value.is_a? Array
+          @table[index_or_header] = Row.new(headers, value)
+        else
+          @table[index_or_header] = value
+        end
+      else                 # set column
+        unless index_or_header.is_a? Integer
+          index = @headers.index(index_or_header) || @headers.size
+          @headers[index] = index_or_header
+        end
+        if value.is_a? Array  # multiple values
+          @table.each_with_index do |row, i|
+            if row.header_row?
+              row[index_or_header] = index_or_header
+            else
+              row[index_or_header] = value[i]
+            end
+          end
+        else                  # repeated value
+          @table.each do |row|
+            if row.header_row?
+              row[index_or_header] = index_or_header
+            else
+              row[index_or_header] = value
+            end
+          end
+        end
+      end
+    end
+
+    # :call-seq:
+    #   table.values_at(*indexes) -> array_of_rows
+    #   table.values_at(*headers) -> array_of_columns_data
+    #
+    # If the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
+    # and each argument is either an \Integer or a \Range,
+    # returns rows.
+    # Otherwise, returns columns data.
+    #
+    # In either case, the returned values are in the order
+    # specified by the arguments.  Arguments may be repeated.
+    #
+    # ---
+    #
+    # Returns rows as an \Array of \CSV::Row objects.
+    #
+    # No argument:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.values_at # => []
+    #
+    # One index:
+    #   values = table.values_at(0)
+    #   values # => [#<CSV::Row "Name":"foo" "Value":"0">]
+    #
+    # Two indexes:
+    #   values = table.values_at(2, 0)
+    #   values # => [#<CSV::Row "Name":"baz" "Value":"2">, #<CSV::Row "Name":"foo" "Value":"0">]
+    #
+    # One \Range:
+    #   values = table.values_at(1..2)
+    #   values # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # \Ranges and indexes:
+    #   values = table.values_at(0..1, 1..2, 0, 2)
+    #   pp values
+    # Output:
+    #   [#<CSV::Row "Name":"foo" "Value":"0">,
+    #    #<CSV::Row "Name":"bar" "Value":"1">,
+    #    #<CSV::Row "Name":"bar" "Value":"1">,
+    #    #<CSV::Row "Name":"baz" "Value":"2">,
+    #    #<CSV::Row "Name":"foo" "Value":"0">,
+    #    #<CSV::Row "Name":"baz" "Value":"2">]
+    #
+    # ---
+    #
+    # Returns columns data as row Arrays,
+    # each consisting of the specified columns data for that row:
+    #   values = table.values_at('Name')
+    #   values # => [["foo"], ["bar"], ["baz"]]
+    #   values = table.values_at('Value', 'Name')
+    #   values # => [["0", "foo"], ["1", "bar"], ["2", "baz"]]
+    def values_at(*indices_or_headers)
+      if @mode == :row or  # by indices
+         ( @mode == :col_or_row and indices_or_headers.all? do |index|
+                                      index.is_a?(Integer)         or
+                                      ( index.is_a?(Range)         and
+                                        index.first.is_a?(Integer) and
+                                        index.last.is_a?(Integer) )
+                                    end )
+        @table.values_at(*indices_or_headers)
+      else                 # by headers
+        @table.map { |row| row.values_at(*indices_or_headers) }
+      end
+    end
+
+    # :call-seq:
+    #   table << row_or_array -> self
+    #
+    # If +row_or_array+ is a \CSV::Row object,
+    # it is appended to the table:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table << CSV::Row.new(table.headers, ['bat', 3])
+    #   table[3] # => #<CSV::Row "Name":"bat" "Value":3>
+    #
+    # If +row_or_array+ is an \Array, it is used to create a new
+    # \CSV::Row object which is then appended to the table:
+    #   table << ['bam', 4]
+    #   table[4] # => #<CSV::Row "Name":"bam" "Value":4>
+    def <<(row_or_array)
+      if row_or_array.is_a? Array  # append Array
+        @table << Row.new(headers, row_or_array)
+      else                         # append Row
+        @table << row_or_array
+      end
+
+      self # for chaining
+    end
+
+    #
+    # :call-seq:
+    #   table.push(*rows_or_arrays) -> self
+    #
+    # A shortcut for appending multiple rows. Equivalent to:
+    #   rows.each {|row| self << row }
+    #
+    # Each argument may be either a \CSV::Row object or an \Array:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   rows = [
+    #     CSV::Row.new(table.headers, ['bat', 3]),
+    #     ['bam', 4]
+    #   ]
+    #   table.push(*rows)
+    #   table[3..4] # => [#<CSV::Row "Name":"bat" "Value":3>, #<CSV::Row "Name":"bam" "Value":4>]
+    def push(*rows)
+      rows.each { |row| self << row }
+
+      self # for chaining
+    end
+
+    # :call-seq:
+    #   table.delete(*indexes) -> deleted_values
+    #   table.delete(*headers) -> deleted_values
+    #
+    # If the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
+    # and each argument is either an \Integer or a \Range,
+    # returns deleted rows.
+    # Otherwise, returns deleted columns data.
+    #
+    # In either case, the returned values are in the order
+    # specified by the arguments.  Arguments may be repeated.
+    #
+    # ---
+    #
+    # Returns rows as an \Array of \CSV::Row objects.
+    #
+    # One index:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   deleted_values = table.delete(0)
+    #   deleted_values # => [#<CSV::Row "Name":"foo" "Value":"0">]
+    #
+    # Two indexes:
+    #   table = CSV.parse(source, headers: true)
+    #   deleted_values = table.delete(2, 0)
+    #   deleted_values # => [#<CSV::Row "Name":"baz" "Value":"2">, #<CSV::Row "Name":"foo" "Value":"0">]
+    #
+    # ---
+    #
+    # Returns columns data as column Arrays.
+    #
+    # One header:
+    #   table = CSV.parse(source, headers: true)
+    #   deleted_values = table.delete('Name')
+    #   deleted_values # => ["foo", "bar", "baz"]
+    #
+    # Two headers:
+    #   table = CSV.parse(source, headers: true)
+    #   deleted_values = table.delete('Value', 'Name')
+    #   deleted_values # => [["0", "1", "2"], ["foo", "bar", "baz"]]
+    def delete(*indexes_or_headers)
+      if indexes_or_headers.empty?
+        raise ArgumentError, "wrong number of arguments (given 0, expected 1+)"
+      end
+      deleted_values = indexes_or_headers.map do |index_or_header|
+        if @mode == :row or  # by index
+            (@mode == :col_or_row and index_or_header.is_a? Integer)
+          @table.delete_at(index_or_header)
+        else                 # by header
+          if index_or_header.is_a? Integer
+            @headers.delete_at(index_or_header)
+          else
+            @headers.delete(index_or_header)
+          end
+          @table.map { |row| row.delete(index_or_header).last }
+        end
+      end
+      if indexes_or_headers.size == 1
+        deleted_values[0]
+      else
+        deleted_values
+      end
+    end
+
+    # :call-seq:
+    #   table.delete_if {|row_or_column| ... } -> self
+    #
+    # Removes rows or columns for which the block returns a truthy value;
+    # returns +self+.
+    #
+    # Removes rows when the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>;
+    # calls the block with each \CSV::Row object:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   table.size # => 3
+    #   table.delete_if {|row| row['Name'].start_with?('b') }
+    #   table.size # => 1
+    #
+    # Removes columns when the access mode is <tt>:col</tt>;
+    # calls the block with each column as a 2-element array
+    # containing the header and an \Array of column fields:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   table.headers.size # => 2
+    #   table.delete_if {|column_data| column_data[1].include?('2') }
+    #   table.headers.size # => 1
+    #
+    # Returns a new \Enumerator if no block is given:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.delete_if # => #<Enumerator: #<CSV::Table mode:col_or_row row_count:4>:delete_if>
+    def delete_if(&block)
+      return enum_for(__method__) { @mode == :row or @mode == :col_or_row ? size : headers.size } unless block_given?
+
+      if @mode == :row or @mode == :col_or_row  # by index
+        @table.delete_if(&block)
+      else                                      # by header
+        headers.each do |header|
+          delete(header) if yield([header, self[header]])
+        end
+      end
+
+      self # for chaining
+    end
+
+    include Enumerable
+
+    # :call-seq:
+    #  table.each {|row_or_column| ... ) -> self
+    #
+    # Calls the block with each row or column; returns +self+.
+    #
+    # When the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
+    # calls the block with each \CSV::Row object:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.by_row! # => #<CSV::Table mode:row row_count:4>
+    #   table.each {|row| p row }
+    # Output:
+    #   #<CSV::Row "Name":"foo" "Value":"0">
+    #   #<CSV::Row "Name":"bar" "Value":"1">
+    #   #<CSV::Row "Name":"baz" "Value":"2">
+    #
+    # When the access mode is <tt>:col</tt>,
+    # calls the block with each column as a 2-element array
+    # containing the header and an \Array of column fields:
+    #   table.by_col! # => #<CSV::Table mode:col row_count:4>
+    #   table.each {|column_data| p column_data }
+    # Output:
+    #   ["Name", ["foo", "bar", "baz"]]
+    #   ["Value", ["0", "1", "2"]]
+    #
+    # Returns a new \Enumerator if no block is given:
+    #   table.each # => #<Enumerator: #<CSV::Table mode:col row_count:4>:each>
+    def each(&block)
+      return enum_for(__method__) { @mode == :col ? headers.size : size } unless block_given?
+
+      if @mode == :col
+        headers.each.with_index do |header, i|
+          yield([header, @table.map {|row| row[header, i]}])
+        end
+      else
+        @table.each(&block)
+      end
+
+      self # for chaining
+    end
+
+    # :call-seq:
+    #   table == other_table -> true or false
+    #
+    # Returns +true+ if all each row of +self+ <tt>==</tt>
+    # the corresponding row of +other_table+, otherwise, +false+.
+    #
+    # The access mode does no affect the result.
+    #
+    # Equal tables:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   other_table = CSV.parse(source, headers: true)
+    #   table == other_table # => true
+    #
+    # Different row count:
+    #   other_table.delete(2)
+    #   table == other_table # => false
+    #
+    # Different last row:
+    #   other_table << ['bat', 3]
+    #   table == other_table # => false
+    def ==(other)
+      return @table == other.table if other.is_a? CSV::Table
+      @table == other
+    end
+
+    # :call-seq:
+    #   table.to_a -> array_of_arrays
+    #
+    # Returns the table as an \Array of \Arrays;
+    # the headers are in the first row:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.to_a # => [["Name", "Value"], ["foo", "0"], ["bar", "1"], ["baz", "2"]]
+    def to_a
+      array = [headers]
+      @table.each do |row|
+        array.push(row.fields) unless row.header_row?
+      end
+
+      array
+    end
+
+    # :call-seq:
+    #   table.to_csv(**options) -> csv_string
+    #
+    # Returns the table as \CSV string.
+    # See {Options for Generating}[../CSV.html#class-CSV-label-Options+for+Generating].
+    #
+    # Defaults option +write_headers+ to +true+:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.to_csv # => "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #
+    # Omits the headers if option +write_headers+ is given as +false+
+    # (see {Option +write_headers+}[../CSV.html#class-CSV-label-Option+write_headers]):
+    #   table.to_csv(write_headers: false) # => "foo,0\nbar,1\nbaz,2\n"
+    #
+    # Limit rows if option +limit+ is given like +2+:
+    #   table.to_csv(limit: 2) # => "Name,Value\nfoo,0\nbar,1\n"
+    def to_csv(write_headers: true, limit: nil, **options)
+      array = write_headers ? [headers.to_csv(**options)] : []
+      limit ||= @table.size
+      limit = @table.size + 1 + limit if limit < 0
+      limit = 0 if limit < 0
+      @table.first(limit).each do |row|
+        array.push(row.fields.to_csv(**options)) unless row.header_row?
+      end
+
+      array.join("")
+    end
+    alias_method :to_s, :to_csv
+
+    #
+    # Extracts the nested value specified by the sequence of +index+ or +header+ objects by calling dig at each step,
+    # returning nil if any intermediate step is nil.
+    #
+    def dig(index_or_header, *index_or_headers)
+      value = self[index_or_header]
+      if value.nil?
+        nil
+      elsif index_or_headers.empty?
+        value
+      else
+        unless value.respond_to?(:dig)
+          raise TypeError, "#{value.class} does not have \#dig method"
+        end
+        value.dig(*index_or_headers)
+      end
+    end
+
+    # :call-seq:
+    #   table.inspect => string
+    #
+    # Returns a <tt>US-ASCII</tt>-encoded \String showing table:
+    # - Class: <tt>CSV::Table</tt>.
+    # - Access mode: <tt>:row</tt>, <tt>:col</tt>, or <tt>:col_or_row</tt>.
+    # - Size:  Row count, including the header row.
+    #
+    # Example:
+    #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #   table = CSV.parse(source, headers: true)
+    #   table.inspect # => "#<CSV::Table mode:col_or_row row_count:4>\nName,Value\nfoo,0\nbar,1\nbaz,2\n"
+    #
+    def inspect
+      inspected = +"#<#{self.class} mode:#{@mode} row_count:#{to_a.size}>"
+      summary = to_csv(limit: 5)
+      inspected << "\n" << summary if summary.encoding.ascii_compatible?
+      inspected
+    end
+  end
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/version.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/version.rb
new file mode 100644
index 0000000..227f7f7
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/version.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class CSV
+  # The version of the installed library.
+  VERSION = "3.3.5"
+end
diff --git a/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/writer.rb b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/writer.rb
new file mode 100644
index 0000000..b59f111
--- /dev/null
+++ b/vendor/bundle/ruby/3.4.0/gems/csv-3.3.5/lib/csv/writer.rb
@@ -0,0 +1,209 @@
+# frozen_string_literal: true
+
+require_relative "input_record_separator"
+require_relative "row"
+
+class CSV
+  # Note: Don't use this class directly. This is an internal class.
+  class Writer
+    #
+    # A CSV::Writer receives an output, prepares the header, format and output.
+    # It allows us to write new rows in the object and rewind it.
+    #
+    attr_reader :lineno
+    attr_reader :headers
+
+    def initialize(output, options)
+      @output = output
+      @options = options
+      @lineno = 0
+      @fields_converter = nil
+      prepare
+      if @options[:write_headers] and @headers
+        self << @headers
+      end
+      @fields_converter = @options[:fields_converter]
+    end
+
+    #
+    # Adds a new row
+    #
+    def <<(row)
+      case row
+      when Row
+        row = row.fields
+      when Hash
+        row = @headers.collect {|header| row[header]}
+      end
+
+      @headers ||= row if @use_headers
+      @lineno += 1
+
+      if @fields_converter
+        row = @fields_converter.convert(row, nil, lineno)
+      end
+
+      i = -1
+      converted_row = row.collect do |field|
+        i += 1
+        quote(field, i)
+      end
+      line = converted_row.join(@column_separator) + @row_separator
+      if @output_encoding
+        line = line.encode(@output_encoding)
+      end
+      @output << line
+
+      self
+    end
+
+    #
+    # Winds back to the beginning
+    #
+    def rewind
+      @lineno = 0
+      @headers = nil if @options[:headers].nil?
+    end
+
+    private
+    def prepare
+      @encoding = @options[:encoding]
+
+      prepare_header
+      prepare_format
+      prepare_output
+    end
+
+    def prepare_header
+      headers = @options[:headers]
+      case headers
+      when Array
+        @headers = headers
+        @use_headers = true
+      when String
+        @headers = CSV.parse_line(headers,
+                                  col_sep: @options[:column_separator],
+                                  row_sep: @options[:row_separator],
+                                  quote_char: @options[:quote_character])
+        @use_headers = true
+      when true
+        @headers = nil
+        @use_headers = true
+      else
+        @headers = nil
+        @use_headers = false
+      end
+      return unless @headers
+
+      converter = @options[:header_fields_converter]
+      @headers = converter.convert(@headers, nil, 0, [])
+      @headers.each do |header|
+        header.freeze if header.is_a?(String)
+      end
+    end
+
+    def prepare_force_quotes_fields(force_quotes)
+      @force_quotes_fields = {}
+      force_quotes.each do |name_or_index|
+        case name_or_index
+        when Integer
+          index = name_or_index
+          @force_quotes_fields[index] = true
+        when String, Symbol
+          name = name_or_index.to_s
+          if @headers.nil?
+            message = ":headers is required when you use field name " +
+                      "in :force_quotes: " +
+                      "#{name_or_index.inspect}: #{force_quotes.inspect}"
+            raise ArgumentError, message
+          end
+          index = @headers.index(name)
+          next if index.nil?
+          @force_quotes_fields[index] = true
+        else
+          message = ":force_quotes element must be " +
+                    "field index or field name: " +
+                    "#{name_or_index.inspect}: #{force_quotes.inspect}"
+          raise ArgumentError, message
+        end
+      end
+    end
+
+    def prepare_format
+      @column_separator = @options[:column_separator].to_s.encode(@encoding)
+      row_separator = @options[:row_separator]
+      if row_separator == :auto
+        @row_separator = InputRecordSeparator.value.encode(@encoding)
+      else
+        @row_separator = row_separator.to_s.encode(@encoding)
+      end
+      @quote_character = @options[:quote_character]
+      force_quotes = @options[:force_quotes]
+      if force_quotes.is_a?(Array)
+        prepare_force_quotes_fields(force_quotes)
+        @force_quotes = false
+      elsif force_quotes
+        @force_quotes_fields = nil
+        @force_quotes = true
+      else
+        @force_quotes_fields = nil
+        @force_quotes = false
+      end
+      unless @force_quotes
+        @quotable_pattern =
+          Regexp.new("[\r\n".encode(@encoding) +
+                     Regexp.escape(@column_separator) +
+                     Regexp.escape(@quote_character.encode(@encoding)) +
+                     "]".encode(@encoding))
+      end
+      @quote_empty = @options.fetch(:quote_empty, true)
+    end
+
+    def prepare_output
+      @output_encoding = nil
+      return unless @output.is_a?(StringIO)
+
+      output_encoding = @output.internal_encoding || @output.external_encoding
+      if @encoding != output_encoding
+        if @options[:force_encoding]
+          @output_encoding = output_encoding
+        else
+          compatible_encoding = Encoding.compatible?(@encoding, output_encoding)
+          if compatible_encoding
+            @output.set_encoding(compatible_encoding)
+            @output.seek(0, IO::SEEK_END)
+          end
+        end
+      end
+    end
+
+    def quote_field(field)
+      field = String(field)
+      encoded_quote_character = @quote_character.encode(field.encoding)
+      encoded_quote_character +
+        field.gsub(encoded_quote_character,
+                   encoded_quote_character * 2) +
+        encoded_quote_character
+    end
+
+    def quote(field, i)
+      if @force_quotes
+        quote_field(field)
+      elsif @force_quotes_fields and @force_quotes_fields[i]
+        quote_field(field)
+      else
+        if field.nil?  # represent +nil+ fields as empty unquoted fields
+          ""
+        else
+          field = String(field)  # Stringify fields
+          # represent empty fields as empty quoted fields
+          if (@quote_empty and field.empty?) or (field.valid_encoding? and @quotable_pattern.match?(field))
+            quote_field(field)
+          else
+            field  # unquoted field
+          end
+        end
+      end
+    end
+  end
+end