Boolean Logic in Pure Scala - 2nd cut

Boolean.scala

sealed abstract class Boolean {
  ...
  def &&(other: => Boolean): Boolean
  
  def ||(other: => Boolean): Boolean
  ...
}

case object true1 extends Boolean {
  ...
  override def &&(other: => Boolean): Boolean = other

  override def ||(other: => Boolean): Boolean = this
  ...
}
  
case object false1 extends Boolean {
  ...
  override def &&(other: => Boolean): Boolean = this

  override def ||(other: => Boolean): Boolean = other
  ...
}