Optimize auto memory freed - a more complicated approach #3245
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This is an alternative to #3244 - choose either one.
It uses a heuristic suggested over IRC, to check either the oldest element, or scan from top to bottom.
I think it's an overkill for most cases, but let me know what you think.
BTW Another approach would be zigzag scanning (bottom, top, bottom+1, top-1, .... middle).