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Why are you throwing out all kinds of FP languages when Kotlin is not one?

Kotlin's "not FP" in the way Scala is "not FP" and Swift is "not FP." It's pretty FP, in my experience. Just not strictly. :)

Notice how none of the langs you point out are not mentioned though. Comparing an FP-light to classical FP languages is not equivalent.

Try Arrow.

I already use arrow :)