Run mypy_primer

Narrow `is` with final types correctly #7229

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Run time

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Job	Run time
Run mypy_primer (0)	14m 44s
Run mypy_primer (1)	20m 3s
Run mypy_primer (2)	13m 29s
Run mypy_primer (3)	16m 6s
Run mypy_primer (4)	12m 30s
	1h 16m 52s