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On Tue, 1 Mar 2011, Sylvain Fabre wrote:
> Le 28/02/2011 18:22, Tony Finch a écrit :
> >
> > There is no single variable that refers to the userdata. You will have to
> > mutate it in place to invalidate it.
> Hum... :) What do you mean by "mutate it in place to invalidate it" ?

Change the contents of the userdata itself so that it is no longer a valid
instance of its original type.

f.anthony.n.finch  <>
East Sole, Lundy, Fastnet, Irish Sea: Variable, mainly easterly or
southeasterly 3 or 4. Moderate. Fair. Good.