type keytype 'a t
val create : ?random:bool -> int -> 'a tval clear : 'a t -> unitval reset : 'a t -> unitval copy : 'a t -> 'a tval add : 'a t -> key -> 'a -> unitval remove : 'a t -> key -> unitval find : 'a t -> key -> 'aval find_opt : 'a t -> key -> 'a optionval find_all : 'a t -> key -> 'a listval replace : 'a t -> key -> 'a -> unitval mem : 'a t -> key -> boolval iter : (key -> 'a -> unit) -> 'a t -> unitval filter_map_inplace : (key -> 'a -> 'a option) -> 'a t -> unitval fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'bval length : 'a t -> intval stats : 'a t -> statistics