[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 in the docs still needs an update.

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assignee: georg.brandl -> ncoghlan
status: closed -> open

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