protected PackagingElementEntity.Builder<PackagingElementEntity> getBuilder(MutableEntityStorage diff, PackagingElementEntity entity) {
    Ref<PackagingElementEntity.Builder<PackagingElementEntity>> ref = new Ref<>();
    diff.modifyEntity(PackagingElementEntity.Builder.class, entity, o -> {
      ref.set(o);
      return Unit.INSTANCE;
    });
    return ref.get();
  }
protected PackagingElementEntity.Builder<PackagingElementEntity> getBuilder(MutableEntityStorage diff, PackagingElementEntity entity)