I've seen Tk
based scripts rely on this
type of thing to trap window destruction. There's
obviously better ways to do that, so I wouldn't call
it a show stopper.
It might be worth polling the Tk community though, as
they've had a pretty good history of complaining about
GC :). ( regarding Tk's destroy vs DESTROY, and the
underlying XS code hanging on to gobs of memory)
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