There is nothing in upgrade.log because it was never upgraded to version
9. Before, it would have never autoupgraded to 10, but it's entirely
safe to upgrade to 10 immediately.
Of course, annex.autoupgraderepository = false will prevent that
upgrade. So if someone for some reason really wants v9, they can set
that. I can't think of a reason someone would actually want v9 rather
than v10 though.
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