Next actions
------------

1. Do the catcode table stack à la luatex.sty.
2. Merge with luatex.sty (inc test suite).
3. Coordinate release with Heiko.

test suite
----------

- regression checks on the results of the tests (sed+diff the log)
- add debug messages to be used in the test suite?
- import test files from luatex.sty

luatex.sty
----------

- do it (depends on cctb update)
- provide \newcatcodetable & all for now, used in l3luatex.sty (to be
  investigated), with a depcracation warning

compat
------

- clarify doc/comments about relying on etex/pdf primitives
- import some error checking from Heiko's \LuT@MakeLuatexPrimitive

modutils
--------

- make `\listfiles` show Lua modules?

cctb
----

- stack à la luatex.sty
- support for unicode-letters?

mcb
---

- add an analogue of `callback.find()`, see #4

bytecode registers
------------------

- create submodule for that
- only lua interface, most probably
