[issue12713] argparse: allow abbreviation of sub commands by users

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3310ea7dbe30 by Vinay Sajip in branch 'default':
Issue #12713: reverted fix pending further discussion.
https://hg.python.org/cpython/rev/3310ea7dbe30

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<http://bugs.python.org/issue12713>
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