[issue4561] Optimize new io library

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Your issue is most like caused by #4533. Please download the latest svn
version of Python 3.0 (branches/release30_maint) and try again.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4561>
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