Stefan Behnel <stefan...@behnel.de> added the comment:

>> Commutativity guarantees can be delivered by sorting arguments before 
>> summation.

> No thanks -- that's too expensive for such a small payoff.

Since I don't really see people use this on vectors with hundreds of 
dimensions, let me still suggest using insertion sort. It's simple and short to 
implement into the current code (right in the first loop) and should be plenty 
fast for any reasonable usage of this function.

----------
nosy: +scoder

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<https://bugs.python.org/issue33089>
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