Scala: Nil vs List()

by 
scala> println (Nil == List())
true

scala> println (Nil eq List())
true

scala> println (Nil equals List())
true

scala> System.identityHashCode(Nil)
374527572

scala> System.identityHashCode(List())
374527572

Nil is more idiomatic and can be preferred in most cases.
Questions?

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