FWIW I think -1 was an olde ways ancient magicks kind of thing in the Before Times when the universe was being created, and was quickly abandoned for 0. So in these modern times, 0 is just as good as -1, but for this brief period of turmoil, it happens that -1 would have been the safer bet. Vanilla Lua uses 0 to mean "not set" a lot though, so take from that what you will.
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