Inconsistent behavior between Lua 5.1 and LuaJit

nilortwelve.lua

function advise (adviceFn, ogFn) 
	return function (...) adviceFn(unpack(arg)) ogFn(unpack(arg)) end
end

function foo (x) 
	print ("foo") 
	print (x)
end

function bar (x) 
	print "bar" 
	print (x) 
end

function main ()
	foo = advise(foo,bar)
	print "working"
end

foo(12)
main()
foo(12)

NB: this is because arg is deprecated. use adviceFn(...) directly, or a, b = ... to dereference/unpack. Hat-tip Neffi on #lua freenode.