module Obj_tbl:Heterogeneous table for the keys, but polymorphic for the values.sig
..end
type 'a
t
val create : unit -> 'a t
val add : 'a t -> 'b Type.ty -> 'b -> 'a -> unit
val find : 'a t -> 'b Type.ty -> 'b -> 'a
val mem : 'a t -> 'b Type.ty -> 'b -> bool
val iter : 'a t -> ('a -> unit) -> unit