[issue9444] argparse does not honor prefix_chars when adding default options

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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nosy: +bethard
stage:  -> unit test needed
type:  -> behavior
versions: +Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9444>
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