Are you referring to "contravariance/covariance"? If so , is that the same as if I suggested that calling the Rectangle method `setWidth` on a Square should re

Are you referring to "contravariance/covariance"? If so , is that the same as if I suggested that calling the Rectangle method `setWidth` on a Square should return a Rectangle (that is _possibly_ a Square)? i.e. val mySquare: Square = new Square(20) val myMutatedSquare: Rectangle = mySquare.setWidth(40) // 20 x 40