growPayload method

@override @protected void growPayload(int newCapacity)

Implementation

@override
@protected
void growPayload(int newCapacity) {
  final grown = List<T?>.filled(newCapacity, null, growable: false);
  for (var i = 0; i < length; i++) {
    grown[i] = _values[i];
  }
  _values = grown;
}