[issue14074] argparse allows nargs>1 for positional arguments but doesn't allow metavar to be a tuple

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +10082
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue14074>
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