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To clarify: np.array() with python 3.8 was calling self.getattr('__array_struct__') or possibly self.hasattr('__array_struct__'). I could not override the method __array_struct__ with the below:

def __array_struct__(self):
        if not self.valid:
            raise InvalidDataIOError("Cannot convert data to array. Data is not valid.")
        return self.__array_struct__()

I would get the error: 'ValueError: invalid __array_struct__' on calls to np.array() that worked otherwise. Maybe there is an issue with name mangling. So instead of overriding the __array_struct__ method, I check for the attribute argument __array_struct__ in the getattr method.