Arrow.kt loading state I used arrow.kt library so many times, I really enjoyed the features they gave to extend kotlin. I like how Either can represent the success/failed states seamlessly. I am just wondering if arrow.kt has a way to represent loading state along with the other two. In other word, we will have a type that offers three states: Success, Failure, Loading. I tried to use Option as right member, but None can't represent loading state as required. Is there any thing I can try?