You can search for identifiers within the package.
in-package search v0.2.0
type 'a t = Format.formatter -> 'a -> unit
type 'a iter = ('a -> unit) -> unit
val unit : unit t
val int : int t
val int8 : char t
val int32 : int32 t
val int64 : int64 t
val float : float t
val bool : bool t
val string : string t
val data : bytes t
val option : 'a t -> 'a option t
val array : 'a t -> 'a array t
val iter : 'a t -> 'a iter t
val list : 'a t -> 'a list t