[issue15023] listextend (and therefore list.extend and list.__init__) peek at len before iter

[R. David Murray]

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


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resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15023>
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