You can search for identifiers within the package.
in-package search v0.2.0
val encode : ('a -> (string -> unit) -> unit) -> 'a option -> (string -> unit) -> unit
val decode : (string -> int ref -> 'a) -> string -> int ref -> 'a option
val sizer : 'a Size.Sizer.t -> 'a option Size.Sizer.t