def to_json_raw_object
            {
              JSON.create_id  => self.class.name,
              'raw'           => self.unpack('C*'),
            }
          end
This method creates a raw object hash, that can be nested into
other data structures and will be unparsed as a raw string. This
method should be used, if you want to convert raw strings to JSON
instead of UTF-8 strings, e. g. binary data.