Component attributes not set if value not {{templar.attribute}}

[ShamariFeaster]

<ColumnHeader sortAttribute="allMEdia"></ColumnHeader>

Templar.component('ColumnHeader',{
templateURL : '/js/Components/ColumnHeader.html',
attributes : {
sortattribute : function(self, val){
//this will not execute
self.dataset['sortAttribute'] = val;
}
}
});