BUG: ignore kwarg=None in constrained calls #123

Job	Run time
Test against different Python versions (3.7, ubuntu-latest)	27s
Test against different Python versions (3.7, windows-latest)	1m 41s
Test against different Python versions (3.7, macos-latest)	1m 8s
Test against different Python versions (3.8, ubuntu-latest)	32s
Test against different Python versions (3.8, windows-latest)	1m 47s
Test against different Python versions (3.8, macos-latest)	44s
Test against different Python versions (3.9, ubuntu-latest)	34s
Test against different Python versions (3.9, windows-latest)	1m 45s
Test against different Python versions (3.9, macos-latest)	39s
Test against different Python versions (3.10, ubuntu-latest)	33s
Test against different Python versions (3.10, windows-latest)	1m 45s
Test against different Python versions (3.10, macos-latest)	43s
Test against different Python versions (3.11, ubuntu-latest)	37s
Test against different Python versions (3.11, windows-latest)	1m 23s
Test against different Python versions (3.11, macos-latest)	1m 8s
	15m 26s

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