`sig val add : 'a BatHashtbl.S.t -> key:BatHashtbl.S.key -> data:'a -> unit val replace : 'a BatHashtbl.S.t -> key:BatHashtbl.S.key -> data:'a -> unit val iter : f:(key:BatHashtbl.S.key -> data:'a -> unit) -> 'a BatHashtbl.S.t -> unit val map : f:(key:BatHashtbl.S.key -> data:'a -> 'b) -> 'a BatHashtbl.S.t -> 'b BatHashtbl.S.t val map_inplace : f:(key:BatHashtbl.S.key -> data:'a -> 'a) -> 'a BatHashtbl.S.t -> unit val filter : f:('a -> bool) -> 'a BatHashtbl.S.t -> 'a BatHashtbl.S.t val filter_inplace : f:('a -> bool) -> 'a BatHashtbl.S.t -> unit val filteri : f:(key:BatHashtbl.S.key -> data:'a -> bool) -> 'a BatHashtbl.S.t -> 'a BatHashtbl.S.t val filteri_inplace : f:(key:BatHashtbl.S.key -> data:'a -> bool) -> 'a BatHashtbl.S.t -> unit val filter_map : f:(key:BatHashtbl.S.key -> data:'a -> 'b option) -> 'a BatHashtbl.S.t -> 'b BatHashtbl.S.t val filter_map_inplace : f:(key:BatHashtbl.S.key -> data:'a -> 'a option) -> 'a BatHashtbl.S.t -> unit val fold : f:(key:BatHashtbl.S.key -> data:'a -> 'b -> 'b) -> 'a BatHashtbl.S.t -> init:'b -> 'b val modify : key:BatHashtbl.S.key -> f:('a -> 'a) -> 'a BatHashtbl.S.t -> unit val modify_def : default:'a -> key:BatHashtbl.S.key -> f:('a -> 'a) -> 'a BatHashtbl.S.t -> unit val modify_opt : key:BatHashtbl.S.key -> f:('a option -> 'a option) -> 'a BatHashtbl.S.t -> unit end`