With respect to instruments for the payment of money issued under this Act, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Act that may appear to be or to have been more restrictive than those Omnibus Bond Acts, (ii) that the provisions of this Act are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Act within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Act that may appear to be or to have been more restrictive than those Omnibus Bond Acts.