Safety checks and warnings for NaN or masked columns. #5433

Job	Run time
Test coverage (ubuntu-latest, 3.10, <6, <2, <1.23)	7m 46s
Test coverage (ubuntu-latest, 3.10, <6, <2, <1.23)	7m 46s
Unit tests (ubuntu-latest, 3.9, ==5.0, ==1.1.6, <1.23)	5m 59s
Unit tests (ubuntu-latest, 3.9, ==5.0, ==1.1.6, <1.23)	5m 59s
Unit tests (ubuntu-latest, 3.9, ==5.0, <2, <1.23)	5m 42s
Unit tests (ubuntu-latest, 3.9, ==5.0, <2, <1.23)	5m 42s
Unit tests (ubuntu-latest, 3.9, <6, ==1.1.6, <1.23)	5m 59s
Unit tests (ubuntu-latest, 3.9, <6, ==1.1.6, <1.23)	6m 1s
Unit tests (ubuntu-latest, 3.9, <6, <2, <1.23)	5m 38s
Unit tests (ubuntu-latest, 3.9, <6, <2, <1.23)	5m 38s
Doc test (ubuntu-latest, 3.9)	41s
Doc test (ubuntu-latest, 3.9)	41s
Test minimal env (ubuntu-latest, 3.10)	50s
Test minimal env (ubuntu-latest, 3.10)	50s
Unit tests (ubuntu-latest, 3.10, ==5.0, ==1.1.6, <1.23)	5m 50s
Unit tests (ubuntu-latest, 3.10, ==5.0, ==1.1.6, <1.23)	5m 50s
Unit tests (ubuntu-latest, 3.10, ==5.0, <2, <1.23)	5m 32s
Unit tests (ubuntu-latest, 3.10, ==5.0, <2, <1.23)	5m 32s
Unit tests (ubuntu-latest, 3.10, <6, ==1.1.6, <1.23)	5m 50s
Unit tests (ubuntu-latest, 3.10, <6, ==1.1.6, <1.23)	5m 50s
API doc completeness test (ubuntu-latest, 3.9)	25s
API doc completeness test (ubuntu-latest, 3.9)	25s
Style check (ubuntu-latest, 3.9)	20s
Style check (ubuntu-latest, 3.9)	20s
Unit tests (ubuntu-latest, 3.10, <6, <2, <1.23)	5m 33s
Unit tests (ubuntu-latest, 3.10, <6, <2, <1.23)	5m 33s
	1h 52m 12s

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