encode_ascii

# File lib/rexml/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