[issue30100] WeakSet should all discard and remove on items that can have weak references

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

dict.pop() supports unhashable values, but dict.__contains__() and dict.get() 
don't:

>>> [] in {}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> {}.get([], 42)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> {}.pop([], 42)
42

OrderedDict.pop() also doesn't support unhashable values:

>>> collections.OrderedDict().pop([], 42)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'

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<http://bugs.python.org/issue30100>
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