Jens Vagelpohl

This appears to be a matter of local scopes not being cleaned up when the local scope is left. Consider this simplistic example with a list of lists. The `tal:condition`...

@malthe Shouldn't this be marked as a bug and not a feature?

I appreciate your comments, but if you look at when I posted this PR it's obvious that PRs here are pointless because they will never be merged.

Thank you for your reply, Graham. I'm not qualified enough to comment intelligently on WSGI affairs in general, so I wouldn't be the person to "take it over". All I'm...

In Zope itself we solved this issue here: https://github.com/zopefoundation/Zope/pull/503

Running this in a Zope instance with ``security-policy-implementation python`` and ``verbose-security on`` helped me debug the original issue in Zope

Don't forget that this may be the first time this ever happened (unpinned requirements from tox.ini breeaking things). Maybe this is for another day when we see it again.

If you look at the `git blame` you will notice that none of us ever touched this code and it's been that way forever. So no, I do not know....

> Okay. But it would imply that a minor release (5.1) would introduce backward incompatibilities. Would it not be better to have those incomoatibilities in a major release? I'd agree...

This is a great candidate for Zope 6