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type key

type +'a t

val empty : 'a t

val is_empty : 'a t -> bool

val mem : key -> 'a t -> bool

val add : key:key -> data:'a -> 'a t -> 'a t

val singleton : key -> 'a -> 'a t

val remove : key -> 'a t -> 'a t

val merge : f:(key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t

val union : f:(key -> 'a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a t

val compare : cmp:('a -> 'a -> int) -> 'a t -> 'a t -> int

val equal : cmp:('a -> 'a -> bool) -> 'a t -> 'a t -> bool

val iter : f:(key:key -> data:'a -> unit) -> 'a t -> unit

val fold : f:(key:key -> data:'a -> 'b -> 'b) -> 'a t -> init:'b -> 'b

val for_all : f:(key -> 'a -> bool) -> 'a t -> bool

val exists : f:(key -> 'a -> bool) -> 'a t -> bool

val filter : f:(key -> 'a -> bool) -> 'a t -> 'a t

val partition : f:(key -> 'a -> bool) -> 'a t -> 'a t * 'a t

val cardinal : 'a t -> int

val bindings : 'a t -> (key * 'a) list

val min_binding : 'a t -> key * 'a

val min_binding_opt : 'a t -> (key * 'a) option

val max_binding : 'a t -> key * 'a

val max_binding_opt : 'a t -> (key * 'a) option

val choose : 'a t -> key * 'a

val choose_opt : 'a t -> (key * 'a) option

val split : key -> 'a t -> 'a t * 'a option * 'a t

val find : key -> 'a t -> 'a

val find_opt : key -> 'a t -> 'a option

val find_first : f:(key -> bool) -> 'a t -> key * 'a

val find_first_opt : f:(key -> bool) -> 'a t -> (key * 'a) option

val find_last : f:(key -> bool) -> 'a t -> key * 'a

val find_last_opt : f:(key -> bool) -> 'a t -> (key * 'a) option

val map : f:('a -> 'b) -> 'a t -> 'b t

val mapi : f:(key -> 'a -> 'b) -> 'a t -> 'b t