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====== Option +unconverted_fields+
Specifies the boolean that determines whether unconverted field values are to be available.
Default value:
CSV::DEFAULT_OPTIONS.fetch(:unconverted_fields) # => nil
The unconverted field values are those found in the source data,
prior to any conversions performed via option +converters+.
When option +unconverted_fields+ is +true+,
each returned row (\Array or \CSV::Row) has an added method,
+unconverted_fields+, that returns the unconverted field values:
str = <<-EOT
foo,0
bar,1
baz,2
EOT
# Without unconverted_fields
csv = CSV.parse(str, converters: :integer)
csv # => [["foo", 0], ["bar", 1], ["baz", 2]]
csv.first.respond_to?(:unconverted_fields) # => false
# With unconverted_fields
csv = CSV.parse(str, converters: :integer, unconverted_fields: true)
csv # => [["foo", 0], ["bar", 1], ["baz", 2]]
csv.first.respond_to?(:unconverted_fields) # => true
csv.first.unconverted_fields # => ["foo", "0"]
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