I've been using zope3 as a wsgi app, without a zodb. it bypasses the zodb
publishing traversal via replacement of the published application, all of
which can be managed in zcml.
One issue I've run into is configuring an app through zope.conf forces you
to have an open zodb, because of the required attribute in zope.app.appsetup
Allowing zope3 usage without a zodb attached, is basically a one line fix
here. Would there be any objections to removing it?
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