Run mypy_primer

Refine `a`, `b`, `c` types after an if comparison like `None in [a, b, c]` #6400

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Run time

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Job	Run time
Run mypy_primer (0)	11m 45s
Run mypy_primer (1)	8m 52s
Run mypy_primer (2)	12m 24s
Run mypy_primer (3)	14m 4s
Run mypy_primer (4)	12m 22s
	59m 27s