Merge from v8 at revision 3723
diff --git a/src/objects.cc b/src/objects.cc
index 118c489..c76fc83 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2839,7 +2839,11 @@
       if (result.IsReadOnly()) return Heap::undefined_value();
       if (result.type() == CALLBACKS) {
         Object* obj = result.GetCallbackObject();
-        if (obj->IsFixedArray()) return obj;
+        if (obj->IsFixedArray()) {
+          PropertyDetails details = PropertyDetails(attributes, CALLBACKS);
+          SetNormalizedProperty(name, obj, details);
+          return obj;
+        }
       }
     }
   }