Tests

Better narrowing with custom equality #20370

Job	Run time
Test mypyc suite with 32-bit Python	9m 26s
Test suite with py311-ubuntu	9m 44s
Test suite with py313-ubuntu, mypyc-compiled	15m 24s
Test suite with py314-windows-64	27m 7s
Test suite with py314-ubuntu, mypyc-compiled	14m 50s
Test suite with py312-ubuntu	9m 44s
Test suite with py314t-ubuntu, mypyc-compiled	17m 11s
Test suite with py310-ubuntu, mypyc-compiled	14m 16s
Type check our own code (py310-ubuntu)	1m 47s
Parallel tests with py314-ubuntu, interpreted	23m 47s
mypyc runtime tests with py313-macos	5m 51s
Formatting and code style with Black + ruff	1m 51s
mypyc runtime tests with py310-ubuntu	5m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 9s
Type check our own code (py310-windows-64)	2m 20s
	3h 6m 50s

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