You can search for identifiers within the package.
in-package search v0.2.0
val map : ('a -> 'b) -> 'a option -> 'b option
val is_some : _ option -> bool
val get_exn : 'a option -> 'a
val value : default:'a -> 'a option -> 'a
val (||) : 'a option -> 'a option -> 'a option