[issue19814] Document prefix matching behavior of argparse, particularly for parse_known_args

[Eli Bendersky]

Eli Bendersky added the comment:

Here's a patch for 3.3; if it looks ok i'll merge it to default and also to 2.7

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keywords: +patch
Added file: http://bugs.python.org/file32870/issue19814.doc33.patch

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