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 TODO and Limitations
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Contributions, bug reports and comments welcomed!

When mocking a class with ``patch``, passing in ``spec=True``, the mock class has an instance
created from the same spec. Should this be the default behaviour for mocks anyway (mock return
values inheriting the spec from their parent), or should it be controlled by an additional
keyword argument (``inherit``) to the Mock constructor?
 
Docstrings!

Could take a patch keyword argument and auto-do the patching in the constructor and unpatch
in the destructor. This would be useful in itself, but violates TOOWTDI and would be unsafe 
for IronPython (non-deterministic calling of destructors).

``Mock`` has several attributes. This makes it unsuitable for mocking objects that use these attribute names. A way round this would be to provide ``start`` and ``stop`` (or similar) methods that *hide* these attributes when needed.