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[Python-Dev] Have a big machine and spare time? Here's a possible Python bug.

> Key invariants:
> ...
> 2. nfp2lasta[pa->nfreepools] == pa if and only if pa is the only arena
> in usable_arenas with that many free pools.

Ack!  Scratch that.  I need a nap :-(

In fact if that equality holds, it means that nfp2lasta entry has to
change if pa is moved and pa->prevarena has the same count of free

So forget about the explanation and just think about the goal - the
details will work themselves out ;-)