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valtron
At least, this would be nice for `py/reduce`: the [last three fields are optional](https://docs.python.org/3/library/pickle.html#object.__reduce__).
Related issue in OpenCV: https://github.com/opencv/opencv/issues/8813 And here's a [workaround](https://github.com/opencv/opencv/issues/8813#issuecomment-390462446).