return Mask(m.Mask())
}

// Contains returns whether *all* flags in other is present in t.
func (t Mask) Contains(other Mask) bool {
	return t&other == other
}

// Overlaps returns whether *any* flags in t overlaps with other.
func (t Mask) Overlaps(other Mask) bool {
	return t&other != 0
}

// SingleType returns whether t has a single type set.
func (t Mask) SingleType() bool {
	return bits.OnesCount64(uint64(t)) == 1
}

// and 0 will be returned if nobody is subscribed for the type(s).
func (ps *PubSub[T, M]) NumSubscribers(mask M) int32 {
	types := Mask(atomic.LoadUint64(&ps.types))
	if !types.Overlaps(Mask(mask.Mask())) {
		return 0
	}
	return atomic.LoadInt32(&ps.numSubscribers)
}

// Subscribers returns the number of current subscribers for all types.
func (ps *PubSub[T, M]) Subscribers() int32 {

	}
	// Mask matches maskString, should get result
	if err := ps.Subscribe(Mask(1|2), ch2, doneCh, func(entry Maskable) bool { return true }); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	// Does NOT overlap maskString
	if err := ps.Subscribe(Mask(2), ch3, doneCh, func(entry Maskable) bool { return true }); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	val := maskString("hello")
	ps.Publish(val)