typing: adding check and fixing #154

Job	Run time
pytester (3.8, ubuntu-latest, local)	4m 0s
pytester (3.8, ubuntu-latest, db)	1m 23s
pytester (3.8, macOS-latest, local)	4m 36s
pytester (3.8, windows-latest, local)	4m 51s
pytester (3.8, windows-latest, db)	4m 27s
pytester (3.9, ubuntu-latest, local)	4m 13s
pytester (3.9, ubuntu-latest, db)	1m 53s
pytester (3.9, macOS-latest, local)	4m 12s
pytester (3.9, windows-latest, local)	4m 47s
pytester (3.9, windows-latest, db)	4m 25s
pytester (3.10, ubuntu-latest, local)	3m 58s
pytester (3.10, ubuntu-latest, db)	1m 19s
pytester (3.10, macOS-latest, local)	4m 16s
pytester (3.10, windows-latest, local)	4m 52s
pytester (3.10, windows-latest, db)	4m 1s
pytester (3.11, ubuntu-latest, local)	4m 2s
pytester (3.11, ubuntu-latest, db)	1m 22s
pytester (3.11, macOS-latest, local)	4m 11s
pytester (3.11, windows-latest, local)	5m 5s
pytester (3.11, windows-latest, db)	4m 21s
pytester (3.12, ubuntu-latest, local)	4m 2s
pytester (3.12, ubuntu-latest, db)	1m 22s
pytester (3.12, macOS-latest, local)	4m 15s
pytester (3.12, windows-latest, local)	4m 57s
pytester (3.12, windows-latest, db)	5m 4s
testing-guardian	1s
	1h 35m 55s

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