You can search for identifiers within the package.
in-package search v0.2.0
type 'a t
type 'a v = (obj -> 'a -> unit) t
type 'a r = (obj -> 'a) t
type u = (obj -> unit) t
val create : string -> (ptr -> 'a) -> 'a v
val create_unit : string -> u
val create_ref : string -> (ptr -> 'a -> unit) -> 'a r
val get_name : 'a t -> string
val get_cb : 'a t -> 'a -> smart_cb