"they can be anything", as per the comment in the line above. Maybe I can change that into "0.0.0-test"... unless the artifacts need to be exported for some reason, it makes no difference at all, though.

Incidentally, I am planning to supplement the existing "set-version" option with an alternative "set-version-suffix". That would retain the existing version, patching just the suffix to something like "-dbuildtest", or "-SNAPSHOT".