text: var obj ={
          sum : function(a, b) {
                return a + b;
              }
            }
              
        var handler = {
                apply: function (target, thisArg, argumentsList) {      
                  return target(argumentsList[0], argumentsList[1]) * 10;
                }
              };
        var proxy1 = new Proxy(obj, handler);
              
        proxy1.sum(1, 2);  
  /*
  { '(/home/anon/jalangi2/experiments/trex/ft_proxy4.js:12:20:12:43)': [ 'Proxy (Native)' ],
    '(/home/anon/jalangi2/experiments/trex/ft_proxy4.js:14:7:14:23)':
     [ '(/home/anon/jalangi2/experiments/trex/ft_proxy4.js:2:15:4:14)' ] }
     */