[issue2690] Precompute range length

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

This issue was missing a priority setting.

Alexander's range-sequence patch still applies cleanly to the Py3k
branch, and "make test" still runs correctly after applying it.

As Alexander notes above, range_contains does still need slightly better
handling of non-integer numbers - I suggest doing a numeric conversion
via PyNumber_Index(el) at the beginning of range_contains, and if that
conversion fails, do a conversion via PyNumber_Long(el) and immediately
return False if the result is not equal to el itself (i.e. only integer
values of non-integer types will be found in the range.

Since that explanation got kind of complicated, I've added a modified
patch that includes the above change, and adds a couple of additional
tests to ensure a non-integer floating point value won't be found in the
sequence.

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keywords: +needs review
priority:  -> release blocker
Added file: http://bugs.python.org/file11345/issue2690-range-sequence-ncoghlan.diff

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