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Roberto Ierusalimschy wrote:

When a userdata has a __gc method, the first collection triggers the
finalizer, but the object is still alive (because the finalizer gets it
as a parameter, and may even resurect it). Only the next collection will
free the object. (Java has a similar behavior.)

Oh, thanks, didn't know that (should it be mentioned in the Manual?)
And why Luiz had different results then?