This quick fix will be removed when proper dataclass serialization 
support is added to dill. This is just here to allow for better support, 
at least for now. dataclasses pickled with this PR will be unpicklable 
by future versions of dill, but the future versions of dill will be able 
to be automatically use the newer features in dataclasses.py that were 
not available in older versions of Python. That forward compatibility 
features is not present in this PR.