TEST: Fix 313 #351

Job	Run time
Test mypyc suite with 32-bit Python	6m 57s
Test suite with Python nightly	12m 11s
Test suite with py38-ubuntu, mypyc-compiled	17m 35s
Test suite with py38-windows-64	20m 19s
Test suite with py39-ubuntu	16m 35s
Test suite with py310-ubuntu	16m 15s
Test suite with py311-ubuntu, mypyc-compiled	15m 33s
Test suite with py312-ubuntu, mypyc-compiled	18m 53s
mypyc runtime tests with py39-macos	4m 52s
mypyc runtime tests with py38-debug-build-ubuntu	4m 31s
Type check our own code (py38-ubuntu)	1m 53s
Type check our own code (py38-windows-64)	2m 20s
Formatting and code style with Black + ruff	33s
	2h 18m 27s

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