LazilyParsedNumber does not implement Comparable<LazilyParsedNumber>

LazilyParsedNumber extends Number. However, unlike all concrete extensions of Number in Java itself(ex: Double, Float, etc.,), it neither declares to implement Comparable nor implements any such method. i.e, it is a concrete Number that can not be compared itself or any other Number using methods in the class itself(i.e., needs to be done externally, by accessing value).