[Zope-dev] Infuriating ZClass registry Heisenbug

[Jeremy Hylton]

The nice thing about fixing this bug is that the code continues to be
improved.  The last round of beautification made the code
substantially more readable.  This was a direct result of trying to
track down a reference count problem.  The problem proved to be
elsewhere, but it was nearly impossible for me to inspect the old
coptimizations.c code to figure out if the problem was there.

If we make the code easier to read, we reduce the burden we all share
more keeping the software working.  Inscrutable code hides subtle bugs
and encourages work arounds that make the whole system harder to
understand.

Jeremy