[issue6037] MutableSequence.__iadd__ should return self

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

I concur.  Will fix.

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priority:  -> critical
versions: +Python 2.7, Python 3.0, Python 3.1

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<http://bugs.python.org/issue6037>
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