Dan concluded:

   > Certainly doable. Just potentially slow, which is what I'm worried
   > about. Making it not slow has both potential significant complexity
   > and memory usage. If we have to, that's fine. Just want to make
   > sure the cost is known before the decision's made. :)

I rather liked the "delete-means-install-a-pad-walking-placeholder" notion.
That way things only get slow if you actuallt do something evil.

Damian

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