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>   int lua_iterator_next(lua_State* L)
>   {
>     int max = (int) lua_tonumber(L, lua_upvalueindex(1));
>     int cur = (int) lua_tonumber(L, lua_upvalueindex(2));
>     [...]

Have you tried to keep the numbers as "lua_Number"s? The cast from
float/double to int is slow in some machines...

-- Roberto