[Jim Fulton]
> In particular, it might have a reference to the key in an internal
> BTree node.
> (I don't know this to be true, but I wouldn't be surprised if it was
> true.)

It was true when I was working on BTrees ... here, from


    + When a key is deleted, it's physically removed from the bucket
it's in, but
      this doesn't propagate back up the tree: since keys in interior nodes only
      serve to guide searches, it's OK-- and saves time --to leave
"stale" keys in
      interior nodes.

> If this is the case, we can definitely fix it.

Right, just delete that paragraph ;-)
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