containers: intersections for Set, along with Semigroup newtype

Henning Thielemann lemming at
Mon Dec 7 08:43:35 UTC 2020

On Sun, 6 Dec 2020, Reed Mullanix wrote:

> In a perfect world we would use something like Foldable1 from 
> semigroupoids, but sadly that is not in base.

Is it necessary to have it in base for your use? For me, 'NonEmpty.foldl1 
Set.intersection' is perfect.

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