(a) The rights and liabilities created by this chapter shall be construed to be in addition to and not in substitution, exclusion, or displacement of, other rights and liabilities provided by law, including the law of principal and agent, except where the construction would, as a matter of law, be unreasonable.
(b) No art merchant who, as buyer, is excluded from obtaining the benefits of an express warranty under this chapter, shall be deprived of the benefits of any other provision of law by that exclusion.