sig type ('k, 'd) t val make : unit -> ('k, 'd) Ephemeron.K1.Bucket.t val add : ('k, 'd) Ephemeron.K1.Bucket.t -> 'k -> 'd -> unit val remove : ('k, 'd) Ephemeron.K1.Bucket.t -> 'k -> unit val find : ('k, 'd) Ephemeron.K1.Bucket.t -> 'k -> 'd option val length : ('k, 'd) Ephemeron.K1.Bucket.t -> int val clear : ('k, 'd) Ephemeron.K1.Bucket.t -> unit end