Ezio Melotti <ezio.melo...@gmail.com> added the comment:

The problem is when the default placeholder is some unique object() or some 
_internal value (we had something similar with a socket timeout once).
Also for something like str.strip(), would you document chars=None or chars=" 
\n\r\t\v\f"?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13386>
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