Tests

Better narrowing with custom equality #20367

Job	Run time
Test mypyc suite with 32-bit Python	10m 0s
Test suite with py314-ubuntu, mypyc-compiled	15m 23s
Test suite with py312-ubuntu	9m 51s
Test suite with py313-ubuntu, mypyc-compiled	14m 21s
Test suite with py310-ubuntu, mypyc-compiled	14m 48s
Test suite with py311-ubuntu	9m 56s
Test suite with py314-windows-64	27m 31s
Parallel tests with py314-ubuntu, interpreted	25m 17s
mypyc runtime tests with py313-macos	4m 22s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 43s
mypyc runtime tests with py310-ubuntu	5m 26s
Type check our own code (py310-ubuntu)	1m 41s
Formatting and code style with Black + ruff	1m 45s
Type check our own code (py310-windows-64)	2m 28s
Test suite with py314t-ubuntu, mypyc-compiled	17m 6s
	3h 7m 38s

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