anchor.diff:     */
     int _currentTableEndTail;
   
  -  _VTableBuilder _currentVTableBuilder;
  +  _VTable _currentVTable;
   
     Builder({this.initialSize: 1024}) {
       reset();
  
positive.code:    * not added if the [value] is equal to [def].
     */
    void addInt32(int field, int value, [int def]) {
      if (_currentVTableBuilder == null) {
        throw new StateError('Start a table before adding values.');
      }
      if (value != def) {
  
negative.code:    * Write the given list of [values].
     */
    Offset writeList(List<Offset> values) {
      if (_currentVTable != null) {
        throw new StateError(
            'Cannot write a non-scalar value while writing a table.');
      }
  