You can search for identifiers within the package.
in-package search v0.2.0
type 'a t
val fresh : unit -> 'a t
type (!_, !_) equal =
| Equal : ('a, 'a) equal
| Different : ('a0, 'b) equal
val equal : 'a t -> 'b t -> ('a, 'b) equal
val to_int : 'a t -> int
val is_equal : 'a t -> 'b t -> bool