Given that this only affected upgrades within a development release which is now long since EOL, and since the Python packaging infrastructure now looks quite different, I think it makes sense to just close this bug. Sorry that we didn't deal with it better at the time!
Given that this only affected upgrades within a development release which is now long since EOL, and since the Python packaging infrastructure now looks quite different, I think it makes sense to just close this bug. Sorry that we didn't deal with it better at the time!