code: func ConvertCommentResourceID(request *http.Request, comment comment.Comment, additional ...CommentConvertFunc) *app.Comment {
  	c := &app.Comment{
  		Type: APIStringTypeComments,
  		ID:   &comment.ID,
  	}
  	for _, add := range additional {
  		add(request, &comment, c)
  	}
  	return c
  }
docs: // ConvertCommentResourceID converts between internal and external REST representation, ResourceIdentificationObject only