[issue30691] WeakSet is not pickleable

[Raymond Hettinger]

Raymond Hettinger added the comment:

> If you pickle also hard refereces to the items,
>  a WeakSet can be pickled and unpickled as expected (after 
> fixing __reduce__).

That seems contrary to the original intent of a WeakSet.  I recommend not going down the path of adding pickle support.

If copying is also broken, then it is reasonable to either fix it or remove it depending on whether a fix is straight-forward.

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<http://bugs.python.org/issue30691>
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