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Validate `vers` qualifier #461

Job	Run time
Lint & mypy	23s
Test & build (py3.8 on ubuntu-latest)	23s
Test & build (py3.10 on ubuntu-latest)	18s
Test & build (py3.10 on windows-latest)	48s
Test & build (py3.12 on ubuntu-latest)	18s
Test & build (py3.12 on macos-latest)	20s
Test & build (py3.13 on macos-latest)	22s
Test & build (py3.11 on windows-latest)	1m 1s
Test & build (py3.13 on windows-latest)	42s
Test & build (py3.8 on windows-latest)	1m 27s
Test & build (py3.12 on windows-latest)	56s
Test & build (py3.9 on windows-latest)	1m 24s
Test & build (py3.9 on macos-latest)	43s
Test & build (py3.10 on macos-latest)	35s
Test & build (py3.11 on macos-latest)	18s
Test & build (py3.11 on ubuntu-latest)	17s
Test & build (py3.8 on macos-latest)	53s
Test & build (py3.9 on ubuntu-latest)	22s
Test & build (py3.13 on ubuntu-latest)	19s
	11m 49s