<ChangeLog>
- Fixed a bug that may slow down significantly (from a few milliseconds
to many seconds) server side intersections when a background write is
in progress. This was due to the hash table resize policy, prevented when
there was a saving child. Now it's prevented only up to 5 times
overbooking, so we try hard to prevent a lot of copy on write, but
avoiding to trigger pathological hash table performances of O(N) instead
of O(1).
- Fixed expired keys counter in INFO output. It was not counting keys
force-expired due to max-memory limit reached.
</ChangeLog>
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