You can search for identifiers within the package.
in-package search v0.2.0
val encoding_guess : string -> [ `UTF_16BE | `UTF_16LE | `UTF_8 ] * bool
type !'a folder = 'a -> int -> [ `Malformed of string | `Uchar of uchar ] -> 'a
val fold_utf_8 : 'a folder -> 'a -> string -> 'a
val fold_utf_16be : 'a folder -> 'a -> string -> 'a
val fold_utf_16le : 'a folder -> 'a -> string -> 'a