Run mypy_primer

Narrow `is` with final types correctly #3

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Job	Run time
Run mypy_primer (0)	22m 58s
Run mypy_primer (3)	23m 58s
Run mypy_primer (1)	47m 17s
Run mypy_primer (4)	21m 22s
Run mypy_primer (2)	21m 28s
Join artifacts	3s
	2h 17m 6s