Tests

TEST: Fix 313 #339

Job	Run time
Test mypyc suite with 32-bit Python	6m 55s
Test suite with Python nightly	12m 32s
Test suite with py38-ubuntu, mypyc-compiled	6m 21s
Test suite with py38-windows-64	18m 56s
Test suite with py39-ubuntu	16m 17s
Test suite with py310-ubuntu	15m 36s
Test suite with py311-ubuntu, mypyc-compiled	15m 40s
Test suite with py312-ubuntu, mypyc-compiled	17m 32s
mypyc runtime tests with py39-macos	4m 22s
mypyc runtime tests with py38-debug-build-ubuntu	3m 38s
Type check our own code (py38-ubuntu)	1m 40s
Type check our own code (py38-windows-64)	2m 16s
Formatting and code style with Black + ruff	35s
	2h 2m 20s

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