Merge pull request #100 from luigibonati/fix_split_function #889

Job	Run time
Test on macOS-latest, Python 3.8	4m 50s
Test on macOS-latest, Python 3.9	4m 29s
Test on macOS-latest, Python 3.10	4m 2s
Test on ubuntu-latest, Python 3.8	10m 27s
Test on ubuntu-latest, Python 3.9	10m 28s
Test on ubuntu-latest, Python 3.10	10m 29s
Test on windows-latest, Python 3.8	5m 39s
Test on windows-latest, Python 3.9	4m 1s
Test on windows-latest, Python 3.10	6m 27s
	1h 0m 52s

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