While any of the bonds issued by the authority remain outstanding, the powers, duties, or existence of the authority or of its officers, employees, or agents shall not be diminished or impaired in any manner that will affect adversely the interests and rights of the holders of such bonds, nor will the state itself in any way obstruct, prevent, impair, or render impossible the due and faithful performance by the authority of its duties. This part shall be for the benefit of the state, the authority, and each and every holder of the authority's bonds and, upon and after the issuance of bonds under this part, shall constitute an irrevocable contract with the holders of such bonds.