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LuaJIT does not support 5.3 and given the fact that the project has been pretty dead recently I don't think it ever will. This sucks because I really like 5.3 but the performance of PUC-Rio's implementation is really terrible compared to LuaJIT.
Will Lua 5.3 ever get a JIT compiler? It's been about 2 years since it's release yet nothing.