Even with that patch, I'm still getting backtraces similar to this:

Traceback (most recent call last):
  File "/home/user/foo/src/foo", line 83, in <module>
    foomain(sys.argv)
  File "/home/uli/foo/src/foo", line 79, in foomain
    foolib.main.cmdmain(sys.argv)
  File "./foolib/main.py", line 250, in cmdmain
  File "./foolib/main.py", line 199, in main
  File "./foolib/main.py", line 180, in __init__
  File "./foolib/main.py", line 115, in __get__
AttributeError: property--48216a94

Looks like I should write a dozen test cases I can think of on my own. :)