active

type Active[K comparable, V state.Stateful[V]] interface {
	Add(k K, v V)
	Delete(k K)
	Contains(k K) (ok bool)
	Get(k K) (v V, ok bool)
	Map() map[K]V
	Update(k K, v V)
	UpdateFunc(k K, cb func(v V))
	Len() int64
	Close() error
}