if I want a Either<A,B> can I just use ``` s...
# functional
b
if I want a Either<A,B> can I just use
Copy code
sealed class Either<A, B> {
    class Left<A, B>(val left: A) : Either<A, B>()
    class Right<A, B>(val right: B) : Either<A, B>()
}
or is that more recommended to use external libs?