Antoine Pitrou added the comment:

> Now about __len__() returning a wrong result: it is a more complicated issue, 
> I fear.  I already patched weakref.py inside PyPy in order to pass a unit 
> test inside CPython's test suite.  This patch is to change __len__ to look 
> like this: [...]

Thanks for the explanation. Yes, you are right on the principle. But there is 
also a general expectation that len() on an in-memory container is a O(1) 
operation, not O(n) - this change would break that expectation quite heavily.

I don't know how to fix len() without losing O(1) performance. It seems we're 
in a bit of a quandary on this topic. However, we can still fix the other 
issues.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28427>
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