Only parameters in the first parameter section are considered for equality and hashing.
scala> case class Foo(a: Int)(b: Int) defined class Foo scala> Foo(0)(0) == Foo(0)(1) res0: Boolean = true scala> Seq(0, 1).map(Foo(0)(_).hashCode) res1: Seq[Int] = List(-1669410282, -1669410282)
b as a field:
scala> case class Foo(a: Int)(val b: Int) defined class Foo scala> Foo(0)(1).b res3: Int = 1
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