anchor.diff:     * Sets the style property with the specified name, using the specified
      * priority.
      */
  -  style(final String name, final Object value, [String priority=""]) {
  +  void style(final String name, final Object value, [String priority=""]) {
       if (value == null) {
         styleNull(name);
         return;
  
positive.code:    * DOM element. The function's return value is then used to set each
     * element's attribute. A null value will remove the specified attribute.
     */
    attrFunc(final String name, final objectFunction fn) {
      final qualified = core.qualify(name);
      if (qualified.space != null) {
        each((node, data, i, j) {
  
negative.code:    * Sets the attribute with the specified name to the specified value
     * on all selected elements.
     */
    void attr(final String name, final Object value) {
      if (value == null) {
        attrNull(name);
        return;
  