I still have a notion that some improvements made on the 2.7 branch are not merged into the SVN trunk, e.g. http://cvs.zope.org/Zope/lib/python/AccessControl/Attic/ZopeGuards.py.diff?r1=18.104.22.168&r2=22.214.171.124
There is some debate here whether those changes (which Jim made only relunctantly back in January 2004) should be promulgated to 2.8. We will fold them in after the alpha, if so.
The link above points to an other unmerged change. I don't understand the complete change, but at least removing Python 2.1 compatibility code should also be done on the trunk.
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