Tests

Stricter handling of submodules as attributes (#20179) #19286

Job	Run time
Test mypyc suite with 32-bit Python	8m 48s
Test suite with py312-ubuntu, mypyc-compiled	14m 24s
Test suite with py311-ubuntu	9m 40s
Test suite with py313-ubuntu, mypyc-compiled	14m 24s
Test suite with py310-ubuntu	13m 23s
mypyc runtime tests with py313-macos	6m 17s
mypyc runtime tests with py310-ubuntu	4m 42s
Test suite with py314-windows-64	26m 6s
Type check our own code (py39-windows-64)	2m 32s
Test suite with py39-ubuntu, mypyc-compiled	16m 24s
Type check our own code (py39-ubuntu)	1m 41s
Formatting and code style with Black + ruff	2m 4s
Test suite with py314-ubuntu, mypyc-compiled	15m 1s
	2h 15m 26s

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