support for duplicate values

[ArcticLord]

Do you have plans for supporting duplicate values in options?
Consider the following options setting:

options: [{ 
	label: 'Group 1',
	options: [{ label: 'Option 1', value: '1' }, { label: 'Option 2', value: '2' }]
},{ 
	label: 'Group 2',
	options: [{ label: 'Option 3', value: '3' }, { label: 'Option 2', value: '2' }]
}]

Option 2 exists twice in Group 1 and Group 2. When select /unselect one of them, the other one should be selected / unselected automatically.
So I can only have either both or none of them selected.

Since document.querySelector('#id').setValue(['2']); works and selects both Option 2 entries I tried something like this:

document.querySelector('#id').addEventListener('change', function() {
	document.querySelector('#id').setValue(this.value);
});

But this will result in an endless loop. There would be problems anyway with this solution because setValue always scrolls to the top.
Do you have any other ideas? Amazing select tool by the way.