Tests

enum and non-nominal narrowing tech #670

Job	Run time
Test mypyc suite with 32-bit Python	10m 49s
mypyc runtime tests with py313-macos	7m 2s
Test suite with py311-ubuntu	8m 53s
Test suite with py314-ubuntu, mypyc-compiled	15m 23s
Test suite with py314-windows-64	24m 36s
Test suite with py310-ubuntu, mypyc-compiled	16m 12s
Test suite with py312-ubuntu	9m 22s
mypyc runtime tests with py310-ubuntu	6m 49s
Test suite with py313-ubuntu, mypyc-compiled	14m 51s
Test suite with py314t-ubuntu, mypyc-compiled	17m 25s
Parallel tests with py314-windows-64, interpreted	8m 44s
Parallel tests with py314-ubuntu, mypyc-compiled	24m 40s
Type check our own code (py310-windows-64)	1m 59s
Type check our own code (py310-ubuntu)	1m 11s
Parallel tests with py314-ubuntu, interpreted	23m 36s
Formatting and code style with Black + ruff	1m 47s
	3h 13m 19s

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