Scala Duration (incl FiniteDuration) pretty print in a way that can be parsed by `Duration.apply`

PrettyDuration.scala

object PrettyDuration {
  import scala.concurrent.duration._
  def show(duration: Duration): String = {
    if (Duration.Inf == duration) {
      "Inf"
    } else if (Duration.MinusInf == duration) {
      "MinusInf"
    } else {
      duration.toCoarsest.toString
    }
  }
}