containers: intersections for Set, along with Semigroup newtype

[Emily Pillmore]

Makes sense to me.

On Sun, Dec 06, 2020 at 2:40 AM, Georgi Lyubenov < godzbanebane at gmail.com > wrote:

> 
> +1 from me
> 
> 
> Seems like additional motivation for adding NonEmptyFoldable (or however
> people want to call it)
> 
> 
> =======
> Georgi
> 
> 
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