class Nokogiri::XML::Node

def to_format save_option, options
  # FIXME: this is a hack around broken libxml versions
  return dump_html if Nokogiri.uses_libxml? && %w[2 6] === LIBXML_VERSION.split('.')[0..1]
  options[:save_with] = save_option unless options[:save_with]
  serialize(options)
end