Change return type of Future.exception to be Optional[BaseException] #3849
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Future.exception can return None if no exception was capture in the future. As documented: https://docs.python.org/3/library/asyncio-future.html#asyncio.Future.exception
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Future.exception can return None if no exception was capture in the future.
As documented: https://docs.python.org/3/library/asyncio-future.html#asyncio.Future.exception