BUG: ignore kwarg=None in constrained calls #120

Job	Run time
Test against different Python versions (3.7, ubuntu-latest)	26s
Test against different Python versions (3.7, windows-latest)	1m 44s
Test against different Python versions (3.7, macos-latest)	1m 15s
Test against different Python versions (3.8, ubuntu-latest)	35s
Test against different Python versions (3.8, windows-latest)	1m 14s
Test against different Python versions (3.8, macos-latest)	1m 0s
Test against different Python versions (3.9, ubuntu-latest)	34s
Test against different Python versions (3.9, windows-latest)	2m 18s
Test against different Python versions (3.9, macos-latest)	43s
Test against different Python versions (3.10, ubuntu-latest)	38s
Test against different Python versions (3.10, windows-latest)	1m 6s
Test against different Python versions (3.10, macos-latest)	1m 22s
Test against different Python versions (3.11, ubuntu-latest)	28s
Test against different Python versions (3.11, windows-latest)	1m 19s
Test against different Python versions (3.11, macos-latest)	51s
	15m 33s

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