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

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> 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.

Thank you for the review.  I'll post some proper responses tomorrow 
evening (GMT).

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