Tests

TEST: Fix 313 #340

Job	Run time
Test suite with Python nightly	12m 19s
Test mypyc suite with 32-bit Python	6m 49s
Test suite with py38-ubuntu, mypyc-compiled	6m 11s
Test suite with py38-windows-64	18m 44s
Test suite with py39-ubuntu	16m 26s
Test suite with py310-ubuntu	15m 37s
Test suite with py311-ubuntu, mypyc-compiled	15m 32s
Test suite with py312-ubuntu, mypyc-compiled	17m 48s
mypyc runtime tests with py39-macos	4m 9s
mypyc runtime tests with py38-debug-build-ubuntu	3m 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	33s
	2h 1m 40s

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