For a tagged PEP 440-style post-release, dunamai chops the dot off and reports that the version does not conform to PEP 440:
$ git describe --tags
v1.31.0.post1
$ git status --porcelain
$ echo $status
0
$ dunamai from git
Version '1.31.0post1' does not conform to the PEP 440 style
For a tagged PEP 440-style post-release, dunamai chops the dot off and reports that the version does not conform to PEP 440: