public static void Update <TEntity, TUpdate, TInterface>(this DbContext db,
IEnumerable <TEntity> saved, IEnumerable <TUpdate> rest,
IEqualityComparer <TInterface> comparer, Action <TEntity, TUpdate> additionalAction = null)
where TEntity : class, TInterface
where TUpdate : class, TInterface
{
Update(db, saved, rest, () => comparer.Compare(saved, rest), additionalAction);
}
