Tests

TEST: Fix 313 #342

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	17m 51s
Test suite with Python nightly	12m 23s
Test mypyc suite with 32-bit Python	6m 47s
Test suite with py38-windows-64	19m 44s
Test suite with py39-ubuntu	16m 25s
Test suite with py310-ubuntu	15m 14s
Test suite with py311-ubuntu, mypyc-compiled	14m 28s
Test suite with py312-ubuntu, mypyc-compiled	17m 42s
mypyc runtime tests with py39-macos	4m 14s
mypyc runtime tests with py38-debug-build-ubuntu	4m 27s
Type check our own code (py38-ubuntu)	1m 45s
Type check our own code (py38-windows-64)	2m 8s
Formatting and code style with Black + ruff	40s
	2h 13m 48s

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