Those are just features that aren't JIT compiled. They are still implemented, in the sense that LuaJIT fully supports them in the interpreter, so you can use t

Those are just features that aren't JIT compiled. They are still implemented, in the sense that LuaJIT fully supports them in the interpreter, so you can use them in LuaJIT programs. I'm guessing that pairs() is not JIT-compiled because iterating over a hash table involves logic that is significantly more complicated than iterating over an array (like ipairs()).