[DGD]upgrading old clones

[Geir Harald Hansen]

> It is arguably wrong for a cloneable object ever to have different
> issues; after all, shouldn't all clones have the same behaviour?
> Therefore I prefer simply to make destructing an object with clones
> impossible.

It is certainly an easy way to keep things clean and tidy.  I'm thinking
of going for this myself, though I guess I will leave it an option in the
object daemon.

Geir Harald Hansen, geirhans at ifi.uio.no

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