Every Stable Release Publication run since v0.21.6 has crashed in
sequencer.discover():
ValueError: v0.21.6 points at a different commit than rc.1-v0.21.6
v0.21.6 took four attempts: rc.1-3 were abandoned (each has its
abandoned-rc.<N> marker) and rc.4 won and became v0.21.6. discover() tested
"does the final tag exist" before "is this attempt abandoned", so for rc.1 it
compared v0.21.6's commit (rc.4's) with rc.1's and raised; the abandoned
branch was only reachable for versions that never got a final tag. Any
version whose winner was not rc.1 broke every later reconcile, including the
next release's publish.
The abandoned marker is now checked first: an abandoned attempt is burned
whatever its version became. A NON-abandoned attempt whose final tag points
elsewhere still raises.
3e1d9dc59a