raw_encoding() private

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# File lib/csv.rb, line 2304
  def raw_encoding
    if @io.respond_to? :internal_encoding
      @io.internal_encoding || @io.external_encoding
    elsif @io.is_a? StringIO
      @io.string.encoding
    elsif @io.respond_to? :encoding
      @io.encoding
    else
      Encoding::ASCII_8BIT
    end
  end
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