You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = 'a option
val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
val iter : ('a -> unit) -> 'a t -> unit
val map : ('a -> 'b) -> 'a t -> 'b t
val fold : ('a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val value_default : ('a -> 'b) -> default:'b -> 'a t -> 'b