type t = Stdlib__Obj.Ephemeron.t
val get_key : t -> int -> obj_t option
val get_key_copy : t -> int -> obj_t option
val set_key : t -> int -> obj_t -> unit
val unset_key : t -> int -> unit
val check_key : t -> int -> bool
val blit_key : t -> int -> t -> int -> int -> unit
val get_data : t -> obj_t option
val get_data_copy : t -> obj_t option
val set_data : t -> obj_t -> unit
val unset_data : t -> unit
val check_data : t -> bool
val blit_data : t -> t -> unit
val max_ephe_length : int