Predef.iterable2ordered does not define an ordering

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The code

package test;

object Test {
  def main(args : Array[String]) : Unit = {
    val l1 = List(1,2,3)
    val l2 = List(1,2,3,4)
    Console.println("l1 compare l2 = " + (l1 compare l2))
    Console.println("l2 compare l1 = " + (l2 compare l1))
  }
}

produces this inconsistent output:

l1 compare l2 = 0
l2 compare l1 = 1

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Imported From: https://issues.scala-lang.org/browse/SI-181?orig=1
Reporter: Florian Hars (fhars)

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@odersky said:
Milestone 2.6.1 deleted