Tests

fix(startup): Differentiate between None vs. 0 port #730

Job	Run time
Linux / Python 3.9 / tox -e security	24s
Linux / Python 3.10 / tox -e security	26s
Linux / Python 3.11 / tox -e security	24s
Linux / Python 3.10 / tox -e lint	35s
Linux / Python 3.9 / tox -e type-checking	8s
Linux / Python 3.10 / tox -e type-checking	39s
Linux / Python 3.11 / tox -e type-checking	36s
Linux / Python 3.9 / tox -e py39	38s
Linux / Python 3.9 / tox -e py39-no-ext	37s
Linux / Python 3.10 / tox -e py310	39s
Linux / Python 3.10 / tox -e py310-no-ext	40s
Linux / Python 3.11 / tox -e py311	40s
Linux / Python 3.12 / tox -e py312	39s
Linux / Python 3.12 / tox -e py312-no-ext	38s
Linux / Python 3.13 / tox -e py313	38s
Linux / Python 3.13 / tox -e py313-no-ext	38s
Windows / Python 3.9 / tox -e py39-no-ext	35s
Windows / Python 3.10 / tox -e py310-no-ext	37s
Windows / Python 3.11 / tox -e py311-no-ext	37s
	10m 48s

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