zope.proxy: class attributes shadow __slots__

[Christian Theune]

Define a subclass from SpecificationDecoratorBase with slots:

class MyProxy(SpecificationDecoratorBase):
    __slots__ = ('foo',)

    foo = None

Now, when using an instance of `MyProxy` the following will happen:

>>> f = MyProxy([])
>>> print f.foo
None
>>> f.foo = 'bar'
>>> print f.foo
None

When not assigning `foo` as a class attribute, it works. IMHO this isn't exactly intended to work this way, but the tests don't specify anything here.

[Tres Seaver (tseaver)]

Now tracked on Github:

  https://github.com/zopefoundation/zope.proxy/issues/1