some minor changes #175

Job	Run time
mypy (3.7)	27s
test (3.7, ubuntu-latest)	1m 8s
mypy (3.8)	25s
test (3.7, windows-latest)	2m 27s
mypy (3.9)	27s
test (3.7, macos-latest)	1m 56s
mypy (3.10)	29s
test (3.8, ubuntu-latest)	1m 4s
mypy (3.11)	24s
test (3.8, windows-latest)	2m 21s
mypy (3.12)	32s
test (3.8, macos-latest)	1m 30s
test (3.9, ubuntu-latest)	1m 4s
test (3.9, windows-latest)	2m 48s
test (3.9, macos-latest)	1m 17s
test (3.10, ubuntu-latest)	1m 6s
test (3.10, windows-latest)	2m 13s
test (3.10, macos-latest)	2m 0s
test (3.11, ubuntu-latest)	1m 4s
test (3.11, windows-latest)	2m 13s
test (3.11, macos-latest)	1m 6s
test (3.12, ubuntu-latest)	1m 47s
test (3.12, windows-latest)	3m 8s
test (3.12, macos-latest)	2m 0s
combine coverage and check for 100%	8s
	35m 4s

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