[issue12776] argparse: type conversion function should be called only once

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Mucking with your installed Python is probably a bad idea, and it may also be an old version (compared to the current development version which has seen hundreds of changes) where testing the patch would not give useful results.  Please see the devguide.

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