Working through the 5th Edition Cocoa book, but in Swift 3. <<<< 3.0.1 and XCode 8.1
The book says these methods will be called automatically by the array controller when they call the add: and remove: methods. They are not. The methods are never called.
func insertObject(employee: Employee, inEmployeesAtIndex index: Int) {
func removeObjectFromEmployeesAtIndex(index: Int) {