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>it's instructive to read the entire thread starting at 
>that message: it mentions lua_checkstack() and
>luaL_checkstack().  also see section 3.2 (The Stack 
>and Indices) in the reference manual.

With lua_checkstack() I could always pass 0 in my first call,
retrieve the stack elements with lua_gettop() and assume that
is the whole stack size. I would then need to store that in
some wrapper structure with a lua_state and this value I
guessed. I'd prefer if there was an API call to avoid me 
duplicating the stack size in some extra variable.