microlens
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at for HashSet
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microlens-mtl has at for Set. However, microlens-platform lacks at for HashSet, in a strange asymmetry with HashMap and Map.
If you contribute a PR, I'll release a new version as soon as possible
Just thinking out loud. (I'd like to see an Iso' (HashSet k) (HashMap k ()) upstream. And one for ordered Set too.)
Anyway, let me know if you're interested in a PR (that doesn't do it this way but merely copies lens' implementation).
Released microlens-platform 0.4.3.5 with #175 included. Thanks @crumbtoo!