type CacheT[V any] interface {
	Has(key string) bool
	Get(key string) (V, bool)
	Set(key string, val V, ttl time.Duration) (err error)
	Del(key string) error
}
type CacheKvT[K comparable, V any] interface {
	Has(key K) bool
	Get(key K) (V, bool)
	Set(key K, val V, ttl time.Duration) (err error)
	Del(key K) error
}