You can search for identifiers within the package.
in-package search v0.2.0
module S : sig ... end
type 'a content
type 'a store = 'a content S.store
val new_store : unit -> 'a store
type 'a rref = 'a content S.rref
val make : 'a store -> 'a -> 'a store * 'a rref
val get : 'a store -> 'a rref -> 'a store * 'a
val set : 'a store -> 'a rref -> 'a -> 'a store
val eq : 'a store -> 'a rref -> 'a rref -> 'a store * bool
val union : ('a -> 'a -> 'a) -> 'a store -> 'a rref -> 'a rref -> 'a store