Safety checks and warnings for NaN or masked columns. #5419

Job	Run time
Test coverage (ubuntu-latest, 3.10, <6, <2, <1.23)	7m 31s
Test coverage (ubuntu-latest, 3.10, <6, <2, <1.23)	7m 52s
Doc test (ubuntu-latest, 3.9)	45s
Doc test (ubuntu-latest, 3.9)	45s
Test minimal env (ubuntu-latest, 3.10)	54s
Test minimal env (ubuntu-latest, 3.10)	54s
API doc completeness test (ubuntu-latest, 3.9)	34s
API doc completeness test (ubuntu-latest, 3.9)	34s
Style check (ubuntu-latest, 3.9)	17s
Style check (ubuntu-latest, 3.9)	17s
Unit tests (ubuntu-latest, 3.9, ==5.0, ==1.1.6, <1.23)	6m 4s
Unit tests (ubuntu-latest, 3.9, ==5.0, ==1.1.6, <1.23)	6m 4s
Unit tests (ubuntu-latest, 3.9, ==5.0, <2, <1.23)	5m 49s
Unit tests (ubuntu-latest, 3.9, ==5.0, <2, <1.23)	5m 49s
Unit tests (ubuntu-latest, 3.9, <6, ==1.1.6, <1.23)	6m 19s
Unit tests (ubuntu-latest, 3.9, <6, ==1.1.6, <1.23)	6m 19s
Unit tests (ubuntu-latest, 3.9, <6, <2, <1.23)	5m 59s
Unit tests (ubuntu-latest, 3.9, <6, <2, <1.23)	5m 59s
Unit tests (ubuntu-latest, 3.10, ==5.0, ==1.1.6, <1.23)	6m 37s
Unit tests (ubuntu-latest, 3.10, ==5.0, ==1.1.6, <1.23)	6m 37s
Unit tests (ubuntu-latest, 3.10, ==5.0, <2, <1.23)	5m 52s
Unit tests (ubuntu-latest, 3.10, ==5.0, <2, <1.23)	5m 52s
Unit tests (ubuntu-latest, 3.10, <6, ==1.1.6, <1.23)	6m 12s
Unit tests (ubuntu-latest, 3.10, <6, ==1.1.6, <1.23)	6m 12s
Unit tests (ubuntu-latest, 3.10, <6, <2, <1.23)	5m 27s
Unit tests (ubuntu-latest, 3.10, <6, <2, <1.23)	5m 27s
	1h 57m 1s

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