I thought that was pretty interesting.  Potentially many, many upper
bits for the taking.  The code also had some logic that would int 3
as soon as a 32-bit refcnt overflowed, and that never hit either
(obviously, based on the numbers above).

I also failed to come up with real-life code that would result in a
Python object having a reference count higher than None's refcnt, but
that may have just been from lack of creativity.

Just thought I'd share.