Here it says:
We have changed sort to use mergesort, which for me is rather surprising since I have been told since I was a toddler to use quicksort. However, the old behavior can be controlled using the sort module; we even have a mystery stable quicksort!
So the switch from quicksort to merge sort apparently happened with 5.8.0. Gee .. I'm out of date. Thanks for pointing that out as well.
Zenon Zabinski | zdog | zdog@perlmonk.org
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