thanks Stepan, your report and suggested solution are much appreciated, i guess i'll go with that. i'm going to this this in 9.0.z.
ok, -U hasn't quite worked out in all corner cases, still there are fixed rpms if you need ones: brew86z: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=44939476 brew90z: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=44939775
*** This bug has been marked as a duplicate of bug 2077036 ***