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 > I spent a bit of time worrying that in use cases where many keys are
 > inserted and removed from a table while the size of the table remains
 > more or less the same, like the hash table attached to a heap that
 > supports update-key in A* or Dijkstra or an LRU cache, the performance
 > may degrade. My mind was put at ease when Roberto shared that all this
 > won't matter anyway, because for use cases like these the table will
 > be regularly rehashed even if it does not change size.

What triggers the rehash?  Is it the movement of the `lastfree` pointer?


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