overloaded method WTF

Foo.scala

object Foo {
  def f(numbers: Int*)(n1:String) = numbers.sum
  def f(numbers: Int*)(n1:String, n2: String) = numbers.sum
  def f(numbers: Int*)(n1:String, n2: String, n3:String) = numbers.sum
}


scala> Foo.f(1,2,3)("n")
<console>:8: error: ambiguous reference to overloaded definition,
both method f in object Foo of type (numbers: Int*)(name: String, n2: String, n3: String)Int
and  method f in object Foo of type (numbers: Int*)(name: String, n2: String)Int
match argument types (Int,Int,Int)
              Foo.f(1,2,3)("n")