Complete tests/memtest_valgrind.py and allow revert-old #131

Job	Run time
Build wheels on windows-latest	14m 23s
Build wheels on macOS-14	7m 29s
Build wheels on macOS-13	15m 8s
Build wheels on windows-11-arm	9m 46s
Build wheels on ubuntu-24.04-arm	10m 25s
Build wheels on ubuntu-latest	10m 31s
	1h 7m 42s

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