[issue5303] Use base 2**30 for Python longs, when possible

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> Well, it might have helped if I'd used the same title for the Rietveld 
> issue as the tracker issue.  I'll get that right next time.

What matters (I think) is that you have [issueXYZ] in the subject.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5303>
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