chick­enize – Use lua call­backs for “in­ter­est­ing” tex­tual ef­fects

The pack­age al­lows ma­nip­u­la­tions of any LuaTeX doc­u­ment (it is known to work with Plain LuaTeX and LuaLaTeX). Most of the pack­age’s func­tions are merely for fun or ed­u­ca­tional use, but some func­tions (for ex­am­ple, col­orstretch for vi­su­al­is­ing the bad­ness and font ex­pan­sion of each line, and let­terspacead­just do­ing what its name says) could be use­ful in a “nor­mal” LuaTeX doc­u­ment.