sys.inherts to shadow constructor property from enumerability

thanks to ES5 features in V8 it is quite easily possible.

lib/sys.js

@@ -315,9 +315,11 @@ exports.pump = function (readStream, writeStream, callback) {
  * @param {function} superCtor Constructor function to inherit prototype from
  */
 exports.inherits = function (ctor, superCtor) {
-  var tempCtor = function(){};
-  tempCtor.prototype = superCtor.prototype;
     ctor.super_ = superCtor;
-  ctor.prototype = new tempCtor();
-  ctor.prototype.constructor = ctor;
+    ctor.prototype = Object.create(superCtor.prototype, {
+        constructor: {
+            value: ctor,
+            enumerable: false
+        }
+    });
 };