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This PR fixes a few upgrade-related issues discovered while releasing 10.1.2:
Note that I don't believe these problems are actually new to 10.1.2; they likely affected earlier 10.1.x releases as well. I'm not sure why I only ran into them this time, but I think behavior is at least partially dependent on the value you put in the "old version" box on the upgrade page, so I probably just did things slightly differently this time.