Tests

TEST: Fix 313 #354

Job	Run time
Test suite with Python nightly	13m 45s
Test mypyc suite with 32-bit Python	6m 43s
Test suite with py38-ubuntu, mypyc-compiled	17m 25s
Test suite with py38-windows-64	20m 22s
Test suite with py39-ubuntu	16m 29s
Test suite with py310-ubuntu	15m 23s
Test suite with py311-ubuntu, mypyc-compiled	15m 7s
Test suite with py312-ubuntu, mypyc-compiled	17m 39s
mypyc runtime tests with py39-macos	6m 22s
mypyc runtime tests with py38-debug-build-ubuntu	4m 20s
Type check our own code (py38-ubuntu)	1m 44s
Type check our own code (py38-windows-64)	2m 28s
Formatting and code style with Black + ruff	38s
	2h 18m 25s

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