The State of California pledges to, and agrees with, the holders of any bonds, other indebtedness, or obligations for the financing of the improvements described in the master plan pursuant to Section 4156, and which are issued or executed and delivered by the commission, the 22nd District Agricultural Association, or a joint exercise of powers entity created by them, that the state will not alter or change the structure of funding of, and deposits to, the commission or the 22nd District Agricultural Association set forth in Article 9.2 (commencing with Section 19605) of Chapter 4 of Division 8 of the Business and Professions Code, or the pledge of funds for debt service, security, including any coverage factors, and expenses entered into pursuant to this Part 3 until the bonds, other indebtedness, or obligations are fully paid or discharged or have been fully provided for in accordance with their terms. However, nothing precludes any alteration or change if and when adequate provision has been made by law for the protection from impairment of the contract represented by the bonds, other indebtedness, or obligations, and the right to alter or change is hereby reserved. The commission, the 22nd District Agricultural Association, and a joint exercise of powers entity created by them, are each authorized to include this pledge and undertaking of the state in their bonds, agreements evidencing other indebtedness, and other indebtedness or obligations for the financing of the improvements described in the master plan pursuant to Section 4156.