I'm looking for an internal globally unique identifier for objects in my
Zope store.

I know that I can use id=object.absolute_url() to create an identifier and
then <something>.resolve_url(id) to recover the object from the identifier
-- but I have two problems with this API:

1. The URL is not really a global identifier, as resolving it seems to
depend on the <something> from which I call resolve_url().  In particular,
if the id is created when Zope is running normally (as a service), and
resolved when running Zope from the command line debugger, the resolve
fails.  This is not good.

2. The need to locate an object <something> carrying the resolve_url()
function is a problem; in particular, I would find it helpful if I could
resolve my global identifier from within a __setstate__() method (where I
have no access to local Zope variables), so I really want a genuinely global
function for resolving my id.

Any suggestions, or do I have to dig into the (disagreeable and uncommented)
bowels of Zope and write my own?

(If this is on the wrong list, please point me to the right one.  Thanks.)

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