sortWith and sortOn have different implementations (specifically, they make a different tradeoff regarding performance – sortWith is faster for cheap functions, sortOn is faster for expensive functions). I'm +1 on adding sortOn, −1 on renaming sortWith to sortOn (as it would be very confusing to have a Data.List.NonEmpty.sortOn that doesn't match Data.List.sortOn), and −0.1 on removing sortWith. On 05/18/2017 07:21 PM, Ömer Sinan Ağacan wrote:

Proposal: Introduce `Data.List.NonEmpty.sortOn` for `Data.List.NonEmpty.sortWith` and deprecate `sortWith`.

Motivation: Data.List.NonEmpty API is very similar to Data.List, except this same function is called `sortOn` in `Data.List`. I think for consistency it'd good to rename `sortWith` to `sortOn`.

Why not rename `sortOn` to `sortWith`? I think `Data.List` is much more widely used than `Data.List.NonEmpty`, so renaming `sortWith` would lead to much less deprecation warnings.

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