[issue31254] WeakKeyDictionary/Mapping doesn't call __missing__

[Antoine Pitrou]

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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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31254>
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