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Roberto Ierusalimschy wrote:

The metatable itself has these bits. When we modify a table there
is no way to know which objects use it as a metatable, so there would
be no way to reset their bits.
Wouldn't it be possible to store a pointer the the internal table structure of the metatable that is ssigned to each table/udata? That way the cost of checking wether a metamethod exists would be one pointer lookup and some bit testing wich is negligible (plus maybe some overhead in lua_setmetatable), and we would be able to have our precious __settable ,__gettable and maybe __next metamethods.

-- Dimitris