You can search for identifiers within the package.
in-package search v0.2.0
encode strings in hex, e.g., "abc" <--> "616263"
val to_hex : ?case:[ `Uppercase | `Lowercase ] -> string -> string
encode string: "abc" --> "616263"
val digit_char_p : ?base:int -> char -> int
interpret the character as a digit in the given base
val from_hex : string -> string
decode string: "616263" --> "abc"