adding track by for detecting changes of complex objects

[ronyf]

According to this issue there's a problem with one-way binding of complex objects.
Angular doesn't detect changes that happen within an object.
There are two solutions... making a clone of the object with angular.copy or adding track by

@Component()
class MyComponent {
  @Input('my-arr track by _id')  myArr: [MyObj];
  @Input('my-obj track by version') myObj: MyObj;
}

I tried applying the second solution using your decorators and it didn't work..
Is there a way to make it work?