Keith Hughitt added the comment:
Although it would be nice if the behavior were normalized between positional
and optional args, it seems like doc patch would be the most straight-forward
at this point. The down-side is that I suspect many people will assume the
behavior for optional args, have it fail, and then consults the docs to see
what happened.
I would suggest making the note pretty obvious or early on in the docs for
argparse.
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