added minor type hinting #723

Job	Run time
Linux / Python 3.9 / tox -e security	25s
Linux / Python 3.10 / tox -e security	28s
Linux / Python 3.11 / tox -e security	27s
Linux / Python 3.10 / tox -e lint	24s
Linux / Python 3.9 / tox -e type-checking	45s
Linux / Python 3.10 / tox -e type-checking	34s
Linux / Python 3.11 / tox -e type-checking	31s
Linux / Python 3.9 / tox -e py39	3m 51s
Linux / Python 3.9 / tox -e py39-no-ext	3m 50s
Linux / Python 3.10 / tox -e py310	3m 44s
Linux / Python 3.10 / tox -e py310-no-ext	3m 34s
Linux / Python 3.11 / tox -e py311	3m 28s
Linux / Python 3.12 / tox -e py312	3m 36s
Linux / Python 3.12 / tox -e py312-no-ext	3m 37s
Linux / Python 3.13 / tox -e py313	3m 50s
Linux / Python 3.13 / tox -e py313-no-ext	3m 34s
Windows / Python 3.9 / tox -e py39-no-ext	4m 53s
Windows / Python 3.10 / tox -e py310-no-ext	5m 24s
Windows / Python 3.11 / tox -e py311-no-ext	4m 55s
	51m 50s

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