[issue4194] default subprocess.Popen buffer size

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

The strange performance between bytes/text 
(BufferedReader/TextIOWrapper) may be explained by the issue #5502.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4194>
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