Tests

Avoid narrowing to NewType #20759

Job	Run time
Test mypyc suite with 32-bit Python	9m 25s
Test suite with py310-ubuntu, mypyc-compiled	14m 42s
mypyc runtime tests with py313-macos	5m 47s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 59s
Test suite with py314-ubuntu, mypyc-compiled	13m 54s
Test suite with py312-ubuntu	8m 46s
Test suite with py314-windows-64	26m 58s
Test suite with py314t-ubuntu, mypyc-compiled	15m 51s
Test suite with py313-ubuntu, mypyc-compiled	14m 35s
Test suite with py311-ubuntu	8m 30s
mypyc runtime tests with py310-ubuntu	5m 32s
Parallel tests with py314-ubuntu, interpreted	22m 8s
Formatting and code style with Black + ruff	1m 51s
Type check our own code (py310-ubuntu)	1m 42s
Type check our own code (py310-windows-64)	2m 21s
	3h 0m 1s

Provide feedback