Use DisallowNone for optional boolean CLI arguments. #137

Job	Run time
initialize / define-constants	3s
test / lint-and-build	1m 19s
test / test-coverage (ubuntu-latest, 3.12)	1m 3s
test / test-coverage (ubuntu-latest, 3.11)	54s
test / test-coverage (ubuntu-latest, 3.14)	54s
test / test-coverage (ubuntu-latest, pypy3.11)	3m 22s
test / test-coverage (ubuntu-latest, 3.10)	49s
test / test-coverage (macos-latest, 3.10)	54s
test / test-coverage (ubuntu-latest, pypy3.10)	3m 59s
test / test-coverage (ubuntu-latest, 3.13)	53s
test / test-coverage (macos-latest, 3.14)	45s
test / test-coverage (macos-latest, pypy3.11)	3m 30s
test / test-coverage (macos-latest, pypy3.10)	3m 38s
test / test-coverage (windows-latest, 3.11)	1m 48s
test / test-coverage (macos-latest, 3.12)	52s
test / test-coverage (windows-latest, 3.12)	2m 15s
test / test-coverage (windows-latest, 3.13)	2m 5s
test / test-coverage (windows-latest, 3.10)	2m 0s
test / test-coverage (macos-latest, 3.11)	53s
test / test-coverage (macos-latest, 3.13)	45s
test / test-coverage (windows-latest, 3.14)	3m 16s
report / report-coverage	42s
	36m 39s

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