Array uniformity in scala

Question

suppose I have a case class

scala> case class a(value:List[Int]) 
scala> val c1 = a(List(1,2,3)) 
scala> val c2 = a(List(1,2,3))
scala> c1 == c2
res2: Boolean = true

But when I change List to Array

scala> case class b(value:Array[Int])
scala> val c3 = b(Array(1,2,3))
scala> val c4 = b(Array(1,2,3))
scala> c3 == c4
res3: Boolean = false

But I really expect c3 and c4 to be equal. Why is this happening?