Tim Peters <t...@python.org> added the comment:

Another runstack.py adds a bad case for 2-merge, and an even worse 
(percentage-wise) bad case for timsort.  powersort happens to be optimal for 
both.

So they all have contrived bad cases now.  powersort's bad cases are the least 
bad.  So far ;-)  But I expect that to remain so.

----------
Added file: https://bugs.python.org/file47807/runstack.py

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<https://bugs.python.org/issue34561>
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