DefineList.sort fires length event on empty list

[m-mujica]

const items = new DefineList({ i: 1 });

items.on('length', () => {
  console.log(items.sort());
});

items.splice(0, 1);

This code causes an infinite loop. I had a similar thing in component with a calls sort in its source list. E.g:

list: {
  get(lastSetValue) {
    return lastSetValue.sort(comparator);
  }
}

I wonder if DefineList.sort should not fire the event and early return if the list is empty.