Proposal: add 'equating' function to Data.List

[Eric Mertens]

I'm -1 on adding equating to base. I don't think it improves over using
`on` or even just a locally defined function or lambda and just adds
another name to learn.

If we do have it I'm also against it going into Data.List, and I would
prefer Data.Eq.

I'm quite happy to have this proposal come up again in a few months and
direct that discussion back to the archive.
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