[Python-3000] Is pickle's persistent_id worth keeping?

[Neil Schemenauer]

Alexandre Vassalotti <alexandre at peadrop.com> wrote:
> There's still one thing I still don't understand about pickle,
> persistent_id. I haven't found any useful use-cases for it. Using
> Google's code search, only Zope (or variant of) seems to have found
> some obscure way to use it.

Durus (an object database similar to ZODB) also uses it.  If it's
not expensive to support, I'd prefer it not to go away.

  Neil