You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = 'a option
val some : 'a -> 'a option
val andThen : f:('a -> 'b option) -> 'a option -> 'b option
val and_then : f:('a -> 'b option) -> 'a option -> 'b option
val or_ : 'a option -> 'a option -> 'a option
val orElse : 'a option -> 'a option -> 'a option
val or_else : 'a option -> 'a option -> 'a option
val map : f:('a -> 'b) -> 'a option -> 'b option
val withDefault : default:'a -> 'a option -> 'a
val with_default : default:'a -> 'a option -> 'a
val values : 'a option list -> 'a list
val toList : 'a option -> 'a list
val to_list : 'a option -> 'a list
val isSome : 'a option -> bool
val is_some : 'a option -> bool
val toOption : sentinel:'a -> 'a -> 'a option
val to_option : sentinel:'a -> 'a -> 'a option