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[Alexander Kjall]

> Space taken up by expired items is reclaimed if the item is looked up
> for any request (get, set, etc.), or when there is no space left and
> it's one of the items that haven't been requested for the longest time
> (in that case, there is no difference between expired and non-expired
> items w.r.t. reclaiming their space).

Consider this senario: I have a large number of keys with low ttl and
medium lookup-rate and some with long ttl and very low lookup-rate.

Does this mean that expired keys with low ttl will push out nonexpired
keys with long ttl.