message: Dart - make sure added padding is zeroed, same as in C++
diff: @@ -352,7 +352,9 @@ class Builder {
  /// interpreted as a 4-byte Latin-1 encoded string that should be placed at
  /// bytes 4-7 of the file.
  Uint8List finish(int offset, [String? fileIdentifier]) {
  - _prepare(max(_sizeofUint32, _maxAlign), fileIdentifier == null ? 1 : 2);
  + final sizeBeforePadding = size();
  + final requiredBytes = _sizeofUint32 * (fileIdentifier == null ? 1 : 2);
  + _prepare(max(requiredBytes, _maxAlign), 1);
  final finishedSize = size();
  _setUint32AtTail(_buf, finishedSize, finishedSize - offset);
  if (fileIdentifier != null) {
  @@ -361,6 +363,14 @@ class Builder {
  fileIdentifier.codeUnitAt(i));
  }
  }
  +
  + // zero out the added padding
  + for (var i = sizeBeforePadding + 1;
  + i <= finishedSize - requiredBytes;
  + i++) {
  + _setUint8AtTail(_buf, i, 0);
  + }
  +
  return _buf.buffer
  .asUint8List(_buf.lengthInBytes - finishedSize, finishedSize);
  }
  @@ -728,6 +738,12 @@ class Builder {
  _buf = _allocator.resize(_buf, newCapacity, _tail, 0);
  }
  }
  +
  + // zero out the added padding
  + for (var i = _tail + 1; i <= _tail + alignDelta; i++) {
  + _setUint8AtTail(_buf, i, 0);
  + }
  +
  // Update the tail pointer.
  _tail += bufSize;
  }
  