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>Note: There is no guarantee that a lightuserdata is a pointer at all.

Not really true. It might not have been a pointer before, but once it became
a lightuserdata it became a pointer... If you cast longs to void* then you're
playing it dangerously in C but once you've done it, Lua is happy and thinks
its is a pointer (but does not think too hard, because it never derefences it).