Tests

fix(startup): Differentiate between None vs. 0 port #728

Job	Run time
Linux / Python 3.9 / tox -e security	23s
Linux / Python 3.10 / tox -e security	25s
Linux / Python 3.11 / tox -e security	26s
Linux / Python 3.10 / tox -e lint	41s
Linux / Python 3.9 / tox -e type-checking	13s
Linux / Python 3.10 / tox -e type-checking	41s
Linux / Python 3.11 / tox -e type-checking	38s
Linux / Python 3.9 / tox -e py39	41s
Linux / Python 3.9 / tox -e py39-no-ext	40s
Linux / Python 3.10 / tox -e py310	43s
Linux / Python 3.10 / tox -e py310-no-ext	42s
Linux / Python 3.11 / tox -e py311	43s
Linux / Python 3.12 / tox -e py312	41s
Linux / Python 3.12 / tox -e py312-no-ext	42s
Linux / Python 3.13 / tox -e py313	40s
Linux / Python 3.13 / tox -e py313-no-ext	41s
Windows / Python 3.9 / tox -e py39-no-ext	38s
Windows / Python 3.10 / tox -e py310-no-ext	40s
Windows / Python 3.11 / tox -e py311-no-ext	41s
	11m 39s

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