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Here is an updated patch, taking Jim's and Antoine's comments into account.
Jim, I ́d like to comment that I think the reason __del__ objects are uncollectable is more subtle than there being no defined order of calling the __del__ functions. More significantly, no python code may be executed during an implicit garbage collection.
Now, it is possible that one could clean up cycles containing only one __del__ method during _expcicit_ collections (calling gc.collect()) but it hardly seems worth the effort.