You can search for identifiers within the package.
in-package search v0.2.0
type 'a encoding
val simple_decode : 'a encoding -> string -> 'a option
val simple_encode : 'a encoding -> 'a -> string
type data = ..
val register_encoding : prefix:string -> length:int -> to_raw:('a -> string) -> of_raw:(string -> 'a option) -> wrap:('a -> data) -> 'a encoding
val check_encoded_prefix : 'a encoding -> string -> int -> unit
val decode : string -> data option