$getProperty method
Get a property by identifier on this instance
Implementation
@override
$Value? $getProperty(Runtime runtime, String identifier) {
  switch (identifier) {
    case 'stackTrace':
      return $value.stackTrace == null
          ? $null()
          : $StackTrace.wrap($value.stackTrace!);
    default:
      return _superclass.$getProperty(runtime, identifier);
  }
}