anchor.diff:  
   class FnxOptionValue {
     final String id;
  -  final String label;
  -  final dynamic value;
  +  String label;
  +  dynamic value;
   
     FnxOptionValue(this.id, this.value, this.label);
   
  
positive.code:     templateUrl: 'fnx_option.html',
      preserveWhitespace: false
  )
  class FnxOption implements OnInit, OnDestroy {
  
    final String id = uid('ov_');
  
  
negative.code: 
    get selected => parent != null && parent.isSelected(value);
  
  
  }
  
  const FNX_SELECT_DIRECTIVES = const [FnxSelect, FnxOption];
  