NaN sorting

What's the purpose of a sorting algorithm, if it doesn't work!?

Prime 4:

And this is what it could (should?) be:

Luc

25-Diamond I

Thats really bad!

In Mathcad 15 I see the very same as in Prime.

NaN's sometimes throws "sort" completely off the track. ot sure when after MC11 that bug was introduced.

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