[issue2690] Precompute range length and enhance range subscript support

[Daniel Stutzbach]

Daniel Stutzbach <stutzbach at google.com> added the comment:

> The descriptions of range's limitations there is no longer accurate
> (slicing is supported following this patch and containment testing is
> now efficient)

Want to open a new issue for that?  (or is there one already?)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2690>
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