Tests

Better narrowing with custom equality #20369

Job	Run time
Test mypyc suite with 32-bit Python	8m 45s
Test suite with py314t-ubuntu, mypyc-compiled	17m 48s
Test suite with py311-ubuntu	9m 40s
Test suite with py314-ubuntu, mypyc-compiled	14m 50s
Test suite with py313-ubuntu, mypyc-compiled	14m 20s
mypyc runtime tests with py310-ubuntu	5m 4s
mypyc runtime tests with py313-macos	4m 56s
Type check our own code (py310-windows-64)	2m 27s
Test suite with py312-ubuntu	9m 40s
Test suite with py310-ubuntu, mypyc-compiled	15m 15s
Parallel tests with py314-ubuntu, interpreted	24m 24s
Formatting and code style with Black + ruff	1m 51s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 16s
Type check our own code (py310-ubuntu)	1m 46s
Test suite with py314-windows-64	28m 20s
	3h 8m 22s

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