[issue24067] Weakproxy is an instance of collections.Iterator

[Gareth Rees]

Gareth Rees added the comment:

> I don't see any reason for proxy objects to be less hashable than ref objects.

The difference is that unlike a ref object, a proxy object is supposed to forward its method calls to the proxied object. So consider what happens if you forward the __hash__ method to the proxied object: the hash will change when the object dies.

A proxy object could, of course, not forward the __hash__ method, instead computing its own hash. But I think this would do more harm than good: surely most attempts to store weakref.Proxy objects in sets or dictionaries are going to be mistakes -- the user should have used a WeakKeyDictionary or a WeakSet instead.

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<http://bugs.python.org/issue24067>
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