func (wc *watchChan) filter(obj runtime.Object) bool {
	if wc.internalPred.Empty() {
		return true
	}
	matched, err := wc.internalPred.Matches(obj)
	return err == nil && matched
}

func (wc *watchChan) acceptAll() bool {
	return wc.internalPred.Empty()
}

// transform transforms an event into a result for user if not filtered.
func (wc *watchChan) transform(e *event) (res *watch.Event) {