val singleton : key -> 'a -> 'a t
val mem : key -> 'a t -> bool
val find_opt : key -> 'a t -> 'a option
val update : key -> ('a option -> 'a option) -> 'a t -> 'a t
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
val union : (key -> 'a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a t
val iter : (key -> 'a -> unit) -> 'a t -> unit
val pp :
(Stdlib.Format.formatter -> 'a -> unit) ->
Stdlib.Format.formatter ->
'a t ->
unit
val to_seq : 'a t -> (key * 'a) Stdlib.Seq.t