type key = G.V.t
val create : int -> 'a t
val clear : 'a t -> unit
val reset : 'a t -> unit
val length : 'a t -> int
val stats : 'a t -> Stdlib.Hashtbl.statistics
val to_seq : 'a t -> (key * 'a) Stdlib.Seq.t
val to_seq_keys : 'a t -> key Stdlib.Seq.t
val to_seq_values : 'a t -> 'a Stdlib.Seq.t
val add_seq : 'a t -> (key * 'a) Stdlib.Seq.t -> unit
val replace_seq : 'a t -> (key * 'a) Stdlib.Seq.t -> unit
val of_seq : (key * 'a) Stdlib.Seq.t -> 'a t