[Zope] zodb garbage

[alex@quad.com.ar]

hey there,
I've experienced a couple of times the following problem:

1. Install someProduct and restart zope
2. Create an empty folder /foo
3. Create an instance fo someProduct as /foo/bar
4. Delete /foo/bar
5. Uninstall someProduct and restart zope
6. Go to /foo and I get an error about someProduct not being found.

the most recent product I've tried where this occurs is exUserFolder.
you can follow the steps 1,2,3&4 and export folder /foo as XML and you will
see a lot of references to exUserFolder remain there (and nope, it's not
because the zodb hasn't been packed)...something weird goes on there. But I
remember this happening before with some other products too (I cant recall
which though)

are there any destructors or anything at all that should be created so this
wont happen ?

Thanks

alex