[Zope] Re[2]: [Zope] User Sessions

[Chris McDonough]

<snip explanation>

> In the scenario where all the per user data is being stored in the user
> object itself, then there is nothing for the user name to be relational
> with, so there's no problem if the username is changed.

This is true, but for the basic Zope user folder implementation, it's more
desirable to keep volatile membership data somewhere else due to the ZODB's
propensity to not like to do a lot of writes.  So we need to key on
something, and it shouldn't be the username, but it can't be anything else
currently.