code: function(s) {
  			var type = (YL.isNull(s) || YL.isUndefined(s)) ? ('' + s) : typeof s;
  			return 'string' === type ? s : type + this.DELIMITER + s;
  		}
docs: Converts the object into a string, with meta data (type), so it can be restored later.
  @method _createValue
  @param s {Object} Required. An object to store.
  @protected