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On Thu, Feb 12, 2009 at 6:18 PM, Peter Cawley <lua@corsix.org> wrote: >> (2) at least one extra table slot on userdata. > That would be the userdata's environment table - > http://www.lua.org/manual/5.1/manual.html#lua_setfenv it would be nice if the __gc entry was on the userdata itself instead of the metatable..