We said that strverscmp_improved() is similar to rpm, so it's nice to include their tests too so we can pin down the differences. Our test is changed to print older<newer instead of newer>older. (I know the computer doesn't care, but I find it much harder to think about when newer is on the left…) The rpm test strings are copied from https://github.com/rpm-software-management/rpm/blob/master/tests/rpmvercmp.at. rpmio is licensed GPL OR LGPL, so we can do that without any issue. (I think it could be argued as "fair use" anyway, but that's not necessary in this case.) I kept the original form as much as possible so it'll be easy to copy things back and forth in the future.
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