code: function toUnicode(input) {
  		return mapDomain(input, function(string) {
  			return regexPunycode.test(string)
  				? decode(string.slice(4).toLowerCase())
  				: string;
  		});
  	}
docs: Converts a Punycode string representing a domain name or an email address
  to Unicode. Only the Punycoded parts of the input will be converted, i.e.
  it doesn't matter if you call it on a string that has already been
  converted to Unicode.
  @memberOf punycode
  @param {String} input The Punycoded domain name or email address to
  convert to Unicode.
  @returns {String} The Unicode representation of the given Punycode
  string.