Antoine Pitrou <pit...@free.fr> added the comment:

> That's because of the _PyIO_ConvertSsize_t converter, which silently
> converts None to -1.
> There's probably a good reason for doing this in the _io module

I'm not sure about the original reason, but I find None as the default 
"omitted" value prettier than -1 myself, so I think it's a good thing :)

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<http://bugs.python.org/issue12021>
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