dist/u.packed.js
function() {
      var args = u.toArray(arguments);
      args.unshift(u.fn);
      return u.extend.apply(this, args);
    }
function() {
      var args = u.toArray(arguments);
      args.unshift(u.fn);
      return u.extend.apply(this, args);
    }
function ( ) { var args = u . toArray ( arguments ) ; args . unshift ( u . fn ) ; return u . extend . apply ( this , args ) ; }
extend method
extend the u.js prototype object
@return {object} u.js prototype
extend method extend the u . js prototype object