include Stdlib.MoreLabels.Hashtbl.S with type key = int
val add : 'a t -> key:key -> data:'a -> unit
val remove : 'a t -> key -> unit
val find_opt : 'a t -> key -> 'a option
val find_all : 'a t -> key -> 'a list
val replace : 'a t -> key:key -> data:'a -> unit
val mem : 'a t -> key -> bool
val iter : f:(key:key -> data:'a -> unit) -> 'a t -> unit
val filter_map_inplace : f:(key:key -> data:'a -> 'a option) -> 'a t -> unit
val fold : f:(key:key -> data:'a -> 'acc -> 'acc) -> 'a t -> init:'acc -> 'acc
val stats : 'a t -> Stdlib__MoreLabels.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
val add_exn : 'a t -> key:key -> data:'a -> unit
val add_multi : 'a list t -> key:key -> data:'a -> unit
val find : 'a t -> key -> 'a option
val set : 'a t -> key:key -> data:'a -> unit