code: function addHandler(cls, replacer, reviver) {
  	if (typeof cls !== "function") {
  		throw new TypeError("'cls' must be class/function");
  	}
  	if (typeof replacer !== "function") {
  		throw new TypeError("'replacer' must be function");
  	}
  	if (typeof reviver !== "function") {
  		throw new TypeError("'reviver' must be function");
  	}
  	__handlers[cls.name] = {
  		cls: cls,
  		replacer: replacer,
  		reviver: reviver
  	};
  }
docs: Adds type handler
  @param {*} cls
  @param {Function} replacer
  @param {Function} reviver