Add support for spec #12427

Job	Run time
Test mypyc suite with 32-bit Python	7m 16s
Test suite with py38-ubuntu, mypyc-compiled	17m 20s
Test suite with py38-windows-64	19m 21s
Test suite with py39-ubuntu	16m 11s
Test suite with py310-ubuntu	15m 25s
Test suite with py311-ubuntu, mypyc-compiled	15m 18s
Test suite with py312-ubuntu, mypyc-compiled	17m 32s
mypyc runtime tests with py39-macos	4m 38s
mypyc runtime tests with py38-debug-build-ubuntu	4m 28s
Type check our own code (py38-ubuntu)	1m 48s
Type check our own code (py38-windows-64)	2m 48s
Formatting and code style with Black + ruff	35s
	2h 2m 40s

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