PY39: Support pre-`or` types #474

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Run time

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Job	Run time
flake8	9s
build (3.8)	1m 8s
build (3.9)	1m 32s
build (3.10)	1m 18s
build (3.11)	1m 22s
build (3.12)	1m 21s
	6m 50s