[issue7105] weak dict iterators are fragile because of unpredictable GC runs

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Anyway, it's not for me to decide.  We have currently three options:
> a) my first patch, which is a duplication of the 3.x work but is
> non-trivial and could bring stability issues
> b) my second patch, which will increase memory use, but to no more
> than previous versions of python used while iterating
> c) do nothing and have iterations over weak dicts randomly break when
> an underlying cycle is unraveled during iteration.

Either a) or c), for me. We shouldn't change semantics in bugfix
releases.

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<http://bugs.python.org/issue7105>
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