[issue26967] argparse: allow_abbrev=False stops -vv from working

[daniel hahler]

daniel hahler <python-bugs at thequod.de> added the comment:

https://github.com/python/cpython/pull/14316 has a fix.

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nosy: +blueyed
versions: +Python 3.7, Python 3.8, Python 3.9

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