For those who wonder, the same encoding can be applied this way:
require 'builder/xchar'
string.to_xs
And to decode, you can do encoded_string.gsub(/\&#([a-f0-9]*);/) { |s|
[$1.to_i].pack('U*') }
Thank you Builder doc!
http://rubydoc.info/gems/builder/2.1.2/frames
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