Message5245

When I converted PyClass to exposed annotations I fixed the problem 
solved by this match, of it not resetting its cached version of values 
like __del__ and __getattr__

I've noticed that PyPy seems to emit a RuntimeWarning to the user if 
they apply a __del__ to a type after the fact. Since I don't see this 
happening very often, that sounds like an ok solution for objects that 
didn't have a __del__ in the first place

Though I haven't seen the FinalizerGuardian technique Leo's refering to, 
it's probably worth looking into