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translate_offset(byte_offset) protected

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# File activesupport/lib/active_support/multibyte/chars.rb, line 205
        def translate_offset(byte_offset) #:nodoc:
          return nil if byte_offset.nil?
          return 0   if @wrapped_string == ''

          begin
            @wrapped_string.byteslice(0...byte_offset).unpack('U*').length
          rescue ArgumentError
            byte_offset -= 1
            retry
          end
        end
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