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> Are there any specific limitations in Lua 4.0.1 on what you can do from
> within a C function as registered gc tag method?

Yes!! Don't do anything :-))

In Lua 4.0 the gc tag methods run when Lua is kind of in the middle
of the collection. As a general rule, do as little as possible in Lua
during a gc tag method. More specifically, do not create new objects
(lua_newtable, lua_pushcfunction, etc.).

-- Roberto