TEST: Fix 313 #347

Job	Run time
Test suite with Python nightly	12m 20s
Test mypyc suite with 32-bit Python	6m 43s
Test suite with py38-ubuntu, mypyc-compiled	17m 30s
Test suite with py38-windows-64	19m 55s
Test suite with py39-ubuntu	16m 29s
Test suite with py310-ubuntu	15m 5s
Test suite with py311-ubuntu, mypyc-compiled	15m 14s
Test suite with py312-ubuntu, mypyc-compiled	17m 24s
mypyc runtime tests with py39-macos	4m 25s
mypyc runtime tests with py38-debug-build-ubuntu	4m 26s
Type check our own code (py38-ubuntu)	1m 46s
Type check our own code (py38-windows-64)	2m 5s
Formatting and code style with Black + ruff	38s
	2h 14m 0s

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