URL-DECODE (STRING &OPTIONAL (LEAVE ))
URL-ENCODE (STRING &OPTIONAL (TO-ESCAPE "#$%&+,/:;<=>?@))
URL-ERROR (FORMAT &REST ARGS)
GET-UTF-8-CHARACTER (BYTES GROUP-SIZE &AUX (START 0))
Given an array of bytes and the amount of bytes to use, extract the character they denote.
Determine the amount of bytes that are part of the character starting with a given byte.
AS-UTF-8-BYTES (CHAR WRITER)
Given a character, calls the writer function for every byte in the encoded form of that character.