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Refactor non nullable to required #1678

Job	Run time
inspect-code (macos-latest)	1m 44s
build-and-test (macos-latest)	1m 44s
inspect-code (ubuntu-latest)	1m 41s
build-and-test (ubuntu-latest)	1m 40s
inspect-code (windows-latest)	1m 29s
cleanup-code (macos-latest)	1m 45s
cleanup-code (ubuntu-latest)	1m 41s
build-and-test (windows-latest)	1m 39s
cleanup-code (windows-latest)	1m 38s
publish	1s
	15m 2s

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