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When the LFC is shrunk, we punch holes in the underlying file to release the disk space to the OS. We tracked it in the same hash table as the in-use entries, because that was convenient. However, I'm working on being able to shrink the hash table too, and once we do that, we'll need some other place to track the holes. Implement a simple scheme of an in-memory array and a chain of on-disk blocks for that.