[issue6012] enhance getargs O& to accept cleanup function

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Reusing O& looks better to me (we already have too many type specifiers). 
Why have you chosen 0x20000 for Py_CLEANUP_SUPPORTED? Are there other
possible values below that?

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6012>
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