Tests

TEST: Fix 313 #349

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	17m 0s
Test suite with Python nightly	12m 33s
Test mypyc suite with 32-bit Python	6m 42s
Test suite with py38-windows-64	19m 38s
Test suite with py39-ubuntu	16m 13s
Test suite with py310-ubuntu	15m 22s
Test suite with py311-ubuntu, mypyc-compiled	15m 16s
Test suite with py312-ubuntu, mypyc-compiled	17m 27s
mypyc runtime tests with py39-macos	4m 7s
mypyc runtime tests with py38-debug-build-ubuntu	4m 27s
Type check our own code (py38-ubuntu)	1m 42s
Type check our own code (py38-windows-64)	2m 8s
Formatting and code style with Black + ruff	34s
	2h 13m 9s

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