[issue1613130] str.split creates new string even if pattern not found

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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stage:  -> needs patch
type: feature request -> performance
versions: +Python 2.7, Python 3.1 -Python 2.5, Python 2.6, Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1613130>
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