Λrrow Optics

toPSetK	PIso that defines the equality between a Set and a SetK`fun <A, B> SetExtensions.~~toPSetK~~():` `PIso<Set<A>,` `Set<B>, SetK<A>, SetK<B>>`
toSetK	Iso that defines the equality between a Set and a SetK`fun <A> SetExtensions.~~toSetK~~():` `Iso<Set<A>, SetK<A>>`