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Quoting "Soni L." <>:

Also with unm and bnot:

"For the unary operators (negation, length, and bitwise NOT), the metamethod is computed and called with a dummy second operand, equal to the first one. This extra operand is only to simplify Lua's internals (by making these operators behave like a binary operation) and may be removed in future versions. (For most uses this extra operand is irrelevant.)"

Thanks guys, should have dived deeper into the manual.