onChange event is triggered without any change

If a Dropdown is set to some option and the same option is selected in the browser again ( no changes ), the onChange event is nevertheless triggered. So it acts as if it would be "onSelect" event.
Should be:
- Either an exactly understood "onChange" should be triggered only if the selected option differs from the previously set one;
- or the event handler should be renamed to "onSelect";
- or at least the above described behavior should be inserted into docs