Bug #4874 ยป 0001-Adding-documentation-for-raw_encoding-method.patch
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private
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#
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# Returns the encoding of the internal IO object or the +default+ if the
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# encoding cannot be determined.
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#
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def raw_encoding(default = Encoding::ASCII_8BIT)
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if @io.respond_to? :internal_encoding
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@io.internal_encoding || @io.external_encoding
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