The faith of the State is hereby pledged that this chapter, any law supplemental or otherwise pertaining thereto, and any other act concerning the bonds or other securities, taxes or the pledged revenues, or any combination of such securities, such taxes and such revenues will not be repealed or amended or otherwise directly or indirectly modified in such a manner as to impair adversely any outstanding bonds or securities until all such bonds and securities have been discharged in full or provision for their payment and redemption has been made fully, including, without limitation, the known minimum yield from the investment or reinvestment of money pledged therefor in federal securities.