citromatik,
If I understand your problem correctly, you are sorting collections by the lowest value found in each collection. If this is the case, then you should modify your solution to use List::Util's min() since sorting the list to find an extreme is wasteful.

Cheers - L~R

In reply to Re: Sorting on 2 fields with the same priority by Limbic~Region
in thread Sorting on 2 fields with the same priority by citromatik

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