Tests

TEST: Fix 313 #341

Job	Run time
Test suite with Python nightly	12m 12s
Test mypyc suite with 32-bit Python	6m 49s
Test suite with py38-ubuntu, mypyc-compiled	6m 16s
Test suite with py38-windows-64	18m 14s
Test suite with py39-ubuntu	16m 32s
Test suite with py310-ubuntu	15m 24s
Test suite with py311-ubuntu, mypyc-compiled	16m 3s
Test suite with py312-ubuntu, mypyc-compiled	18m 1s
mypyc runtime tests with py39-macos	4m 47s
mypyc runtime tests with py38-debug-build-ubuntu	3m 23s
Type check our own code (py38-ubuntu)	1m 44s
Type check our own code (py38-windows-64)	2m 15s
Formatting and code style with Black + ruff	33s
	2h 2m 13s

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