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Why this should be merged
Factored out of #3379.
How this works
The expiry map will be stored in memory, but I also think it's important to have a sensible on-disk representation. This could enable future optimizations. Therefore, the on-disk representation is sorted based on when they will be removed. It is not guaranteed or expected for entries to be added based on this order.
How this was tested
Marshal
andUnmarshal
are bijective.