Define a stricter return type for _parse_message #1176
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If the first item of the tuple is not None, then the second item is guaranteed not to be None either.
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If the first item of the tuple is not None, then the second item is guaranteed not to be None either.
This is motivated by Software Heritage calling this function and getting the value for three (non-None) keys:
so mypy complained. Not a big deal though; I can work around it with assertions: https://gitlab.softwareheritage.org/swh/devel/swh-loader-git/-/merge_requests/153/diffs