code: func (r resourceEntry) EventUpdate(oldObject api.StoreObject) api.Event {
  	if oldObject != nil {
  		return api.EventUpdateResource{Resource: r.Resource, OldResource: oldObject.(resourceEntry).Resource}
  	}
  	return api.EventUpdateResource{Resource: r.Resource}
  }
docs: // ensure that when update events are emitted, we unwrap resourceEntry