6 val set : ('k, 'v) t -> k:'k -> v:'v -> ('k, 'v) t
8 val get : ('k, 'v) t -> k:'k -> 'v option
10 val member : ('k, 'v) t -> k:'k -> bool
12 val to_dot : ('k, 'v) t -> k_to_string:('k -> string) -> string
14 val of_list : ('k * 'v) list -> ('k , 'v) t
15 val to_list : ('k , 'v) t -> ('k * 'v) list