Properly fix unpickling recursion #427
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This PR properly addresses the recursion problems originally encountered in #424 and attempted to fix in #425 but which then created a new problem in #426.
The original recursion issue was caused because during unpickling
getattr(self, "__setstate__")is called if the object does not implement__setstate__. This is not something we want to pass through to the wrapped inner object, so this PR handles this case specifically and ensures anAttributeErroris raised.