exekall: Make serialization test more robust
pickle.dumps() seems to also raise AttributeError sometimes, in addition to pickle.PickleError: AttributeError: Can't pickle local object 'SpawnBase.init..write_to_stdout
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pickle.dumps() seems to also raise AttributeError sometimes, in addition to pickle.PickleError: AttributeError: Can't pickle local object 'SpawnBase.init..write_to_stdout