// or will be other otherwise immediately visible.
		//
		// We just want to make sure that given a non-Inf, non-NaN input,
		// we always get a non-Inf, non-NaN output.
		if !isPositive(kp) || !isPositive(ti) || !isPositive(tt) {
			return
		}
		if !isNormal(min) || !isNormal(max) || min > max {
			return
		}
		// Use a random source, but make it deterministic.
		rs := rand.New(rand.NewSource(800))

  duration: Duration,
): Int {
  check(!duration.isNegative()) { "$name < 0" }
  val millis = duration.inWholeMilliseconds
  require(millis <= Integer.MAX_VALUE) { "$name too large" }
  require(millis != 0L || !duration.isPositive()) { "$name too small" }
  return millis.toInt()
}

internal fun List<Header>.toHeaders(): Headers {
  val builder = Headers.Builder()
  for ((name, value) in this) {