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As Javier suggested, using string representation of tables as keys is probably the only solution to your problem.
An alternative solution is to use tuples, which can be safer and more efficient. If you're interested, check the draft of my attempt for an efficient tuple support for Lua:
http://www.tecgraf.puc-rio.br/~maia/lua/tuple/ Also see: http://lua-users.org/wiki/SimpleTuples http://lua-users.org/wiki/FunctionalTuples
So, it may be that what you want to do is not a "Lua way" thing, and you should reconsider your architecture. :-)
That might be true indeed. ;-) -- Renato Maia Computer Scientist Tecgraf/PUC-Rio __________________________ http://www.inf.puc-rio.br/~maia/