Fix incorrect dot_factor usage #23

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Job	Run time
unit-tests (3.7, ubuntu-20.04)	3m 49s
unit-tests (3.7, macos-latest)	4m 7s
unit-tests (3.7, windows-latest)	4m 1s
unit-tests (3.8, ubuntu-20.04)	5m 4s
unit-tests (3.8, macos-latest)	3m 54s
unit-tests (3.8, windows-latest)	3m 49s
unit-tests (3.9, ubuntu-20.04)	4m 34s
unit-tests (3.9, macos-latest)	4m 30s
unit-tests (3.9, windows-latest)	4m 27s
unit-tests (3.10, ubuntu-20.04)	3m 40s
unit-tests (3.10, macos-latest)	3m 49s
unit-tests (3.10, windows-latest)	3m 32s
unit-tests (3.11, ubuntu-20.04)	3m 31s
unit-tests (3.11, macos-latest)	4m 2s
unit-tests (3.11, windows-latest)	3m 44s
	1h 0m 33s