You can search for identifiers within the package.
in-package search v0.2.0
val mapSecond : ('b -> 'c) -> ('a * 'b) -> 'a * 'c
val map_second : ('b -> 'c) -> ('a * 'b) -> 'a * 'c
val second : ('a * 'b) -> 'b
val first : ('a * 'b) -> 'a
val create : 'a -> 'b -> 'a * 'b