encode_ascii (REXML::Encoding)

    # File temp/encodings/US-ASCII.rb, line 4
        def encode_ascii content
          array_utf8 = content.unpack('U*')
          array_enc = []
          array_utf8.each do |num|
            if num <= 0x7F
              array_enc << num
            else
              # Numeric entity (&#nnnn;); shard by  Stefan Scholl
              array_enc.concat "&\##{num};".unpack('C*')
            end
          end
          array_enc.pack('C*')
        end