code: function(data){
  		return typeof data === 'object' 
  			? JSON.stringify(data) 
  			: (typeof data === 'string' || typeof data === 'number' ? String(data) : null);
  	}
docs: Private serialization method
  @private
  @param data {Object} || {String} || {Number}
  @returns {String} or null on fail