fix: fork should deep clone objects

Author: btford

test/zone.spec.js

@@ -128,6 +128,17 @@ describe('Zone', function () {
     expect(zone.mark).toBe('root');
   });
 
+  describe('fork', function () {
+    it('should fork deep copy', function () {
+      var protoZone = { too: { deep: true } },
+          a = zone.fork(protoZone),
+          b = zone.fork(protoZone);
+
+      expect(a.too).not.toBe(b.too);
+      expect(a.too).toEqual(b.too);
+    });
+  });
+
 });
 
 function throwError () {

zone.js

@@ -39,7 +39,9 @@ function Zone(parentZone, data) {
 
     // set the new zone's hook (replacing the parent zone's)
     } else {
-      zone[property] = data[property];
+      zone[property] = (typeof data[property] === 'object') ?
+                        JSON.parse(JSON.stringify(data[property])) :
+                        data[property];
     }
   });