Tests

Add proper lazy deserialization #21623

Job	Run time
Test mypyc suite with 32-bit Python	10m 32s
Test suite with py314-windows-64	25m 14s
Test suite with py314t-ubuntu, mypyc-compiled	20m 35s
Parallel tests with py314-ubuntu, interpreted	24m 0s
Type check our own code (py310-ubuntu)	1m 46s
Test suite with py314-ubuntu, mypyc-compiled	14m 57s
Test suite with py310-ubuntu, mypyc-compiled	16m 17s
Test suite with py311-ubuntu	9m 9s
Formatting and code style with Black + ruff	1m 59s
Parallel tests with py314-windows-64, interpreted	10m 12s
mypyc runtime tests with py310-ubuntu	6m 7s
mypyc runtime tests with py313-macos	6m 42s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 37s
Test suite with py313-ubuntu, mypyc-compiled	15m 50s
Type check our own code (py310-windows-64)	2m 25s
Test suite with py312-ubuntu	9m 28s
	3h 22m 50s

Provide feedback