[issue5697] heapq.nlargest does not perform stable sort

[DSM]

DSM <dsm001 at users.sourceforge.net> added the comment:

I can't reproduce in current python, and the relevant lines now look like 

        it = izip(iterable, count(0,-1))                    # decorate
    it = izip(imap(key, in1), count(0,-1), in2)             # decorate

It seems that these were fixed long ago by rhettinger in r53244, with
tests checked in to verify behaviour.

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nosy: +dsm001

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