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Does that count as violating the restriction that "you should not change the value of its [the metatable's] field __mode"? This restriction is documented in section 2.9.2, . In other words, if the __mode field does not exist, does creating one count as changing its value. Can you change the value of a non-existant field? Do all fields really exist, it's just that most of them are nil?

Also, "setmetatable(x, y)" appears to evaluate to x. Should this be documented?

David Jones