Overriding observed functions in Ember 1

overriding.md

What is the expected behavior of the following code?

var Superclass = Ember.Object.extend({
  logOnInit: function() {
    console.log('Superclass#logOnInit');
  }.on('init')
});

var Subclass = Superclass.extend({
  logOnInit: function() {
    console.log('Subclass#logOnInit');
    this._super();
  }.on('init')
});

Subclass.create();