include Hashtbl.S with type key = T.t and type 'a t = 'a Hashtbl.Make(T).t
val 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 -> 'acc -> 'acc) -> 'a t -> 'acc -> 'accval to_list : 'a t -> (T.t * 'a) listval of_list : (T.t * 'a) list -> 'a tval memoize : 'a t -> (key -> 'a) -> key -> 'aval map : 'a t -> ('a -> 'b) -> 'b t