Tests

Do not treat `match` value patterns as `isinstance` checks (#20146) #19755

Job	Run time
Test mypyc suite with 32-bit Python	9m 6s
Test suite with py314-ubuntu, mypyc-compiled	14m 0s
Test suite with py312-ubuntu	9m 52s
Test suite with py310-ubuntu, mypyc-compiled	13m 38s
Test suite with py314t-ubuntu, mypyc-compiled	15m 22s
Type check our own code (py310-windows-64)	2m 22s
Parallel tests with py314-ubuntu, interpreted	22m 18s
Test suite with py311-ubuntu	8m 57s
mypyc runtime tests with py313-macos	5m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 18s
Formatting and code style with Black + ruff	2m 0s
Test suite with py313-ubuntu, mypyc-compiled	13m 54s
Type check our own code (py310-ubuntu)	1m 42s
mypyc runtime tests with py310-ubuntu	5m 8s
Test suite with py314-windows-64	26m 26s
	2h 57m 6s

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