[issue9915] speeding up sorting with a key

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

AP: I've already given my blessing to the patch.
Just wanted to note what the existing code did.
I also trust timings but recognize that they
reflect a particular build configuration 
(compiler/processor/o.s)and the usage pattern 
for a particular benchmark.

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<http://bugs.python.org/issue9915>
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