Tests

Refactor equality and identity narrowing for clarity #20159

Job	Run time
Test mypyc suite with 32-bit Python	9m 35s
Test suite with py314-ubuntu, mypyc-compiled	14m 45s
Test suite with py311-ubuntu	9m 13s
Test suite with py314t-ubuntu, mypyc-compiled	17m 35s
Test suite with py312-ubuntu	10m 16s
Test suite with py310-ubuntu, mypyc-compiled	15m 28s
Parallel tests with py314-ubuntu, interpreted	24m 55s
mypyc runtime tests with py313-macos	6m 16s
Test suite with py313-ubuntu, mypyc-compiled	14m 53s
Formatting and code style with Black + ruff	1m 58s
Test suite with py314-windows-64	27m 28s
mypyc runtime tests with py310-ubuntu	5m 38s
Type check our own code (py310-windows-64)	2m 42s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 5s
	3h 10m 27s

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