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

Le lundi 18 octobre 2010 à 13:56 +0000, Alexander Belopolsky a écrit :
> Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:
> 
> On Mon, Oct 18, 2010 at 8:45 AM, Benjamin Peterson
> <rep...@bugs.python.org> wrote:
> ..
> > No, negative values have to be allowed.
> >
> 
> Why?  As far as I can tell, negative values are only used as sentinels
> and we can use say (size_t)-1 instead of -1L.

You can, except that changing the sentinel value will probably break a
lot of code out there (and there's no benefit AFAICT).

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<http://bugs.python.org/issue9778>
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