#84 lazyUpdates can be lost

[Ian Bicking]

If an object is garbage collected and has pending
updates (with lazyUpdate), I don't believe anything
happens -- no error is reported, the updates are
committed, nothing.

Since it is being garbage collected, there's not a lot
that *can* be done. You can't raise errors. Maybe
something could be written to sys.stderr. Whatever it
is, it feels unsafe now.