Antoine Pitrou added the comment:

If someone wants to submit a PR, it would help judge the complexity and 
fragility of adding support for this.  I cannot think of any problem upfront 
myself, but you're right that weak containers have been very difficult to make 
robust against various conditions (and it's probably not over yet).

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nosy: +pitrou

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<http://bugs.python.org/issue31254>
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