[swift-evolution] [Draft] Expanded min/max algorithms

[plx]

I *quite* like `extrema`/`indicesOfExtrema` over minmax.

> On Apr 17, 2016, at 10:03 AM, Patrick Pijnappel <patrickpijnappel at gmail.com> wrote:
> 
> I like the idea. A few notes on naming:
> – minIndex is somewhat confusing to me (it sounds like it's getting the minimum index, i.e. indices.minElement()). How about indexOfMin() or indexOfMinElement()?
> – minmax() also doesn't read very well to me, plus it should technically be minMax() which is kinda ugly. Perhaps limits() or extrema()? The latter would be the most correct mathematically. For the index form that would give e.g. indicesOfExtrema().

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