You can search for identifiers within the package.
in-package search v0.2.0
type pyvalue = t
type t
val create : string -> t
val add_int : t -> string -> int -> unit
val add_string : t -> string -> string -> unit
val add_object : t -> string -> pyvalue -> unit
val add_fn : t -> string -> (Object.t -> pyvalue) -> unit
val capsule_wrapper : unit -> ('a -> Object.t) * (Object.t -> 'a)