You can search for identifiers within the package.
in-package search v0.2.0
type t
val add : t -> string -> (unit -> unit) -> unit
val create : int -> t
val remove : t -> string -> unit
val mem : t -> string -> bool
val find_opt : t -> string -> (unit -> unit) option
val iter : (string -> (unit -> unit) -> unit) -> t -> unit
val clear : t -> unit