Scalaz concurrency issue.

gistfile1.scala

Wanted behavior:
[info] Started 1
[info] Started 2
[info] Started 3
[info] Started 4
[info] Started 5
[info] Finished 5 in 215
[info] Finished 4 in 615
[info] Finished 3 in 825
[info] Finished 2 in 1109
[info] Finished 1 in 2108

Current behavior:
[info] Started 1
[info] Started 3
[info] Finished 3 in 966
[info] Started 4
[info] Finished 4 in 1466
[info] Started 5
[info] Finished 5 in 1566
[info] Started 2
[info] Finished 1 in 2266
[info] Finished 2 in 2566

Code:
import scalaz.concurrent.Task

object ScalazTaskTest extends App {
  val startTime = System.currentTimeMillis()

  def timed(time: Long, num: Int): Task[Unit] = Task.fork(Task {
    println(s"Started $num")
    Thread.sleep(time)
    println(s"Finished $num in ${System.currentTimeMillis() - startTime}")
  })

  timed(2000, 1).runAsync(_ => ())
  timed(1000, 2).runAsync(_ => ())
  timed(700, 3).runAsync(_ => ())
  timed(500, 4).runAsync(_ => ())
  timed(100, 5).runAsync(_ => ())

  Thread.sleep(3000)
}