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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"]