Section 487. Agreement with the state

The state does hereby pledge to and
  agree with the holders of any notes or bonds issued under this  article,
  that  the  state will not limit or alter the rights hereby vested in the
  fund to fulfill the terms  of  any  agreements  made  with  the  holders
  thereof,  or  in  any way impair the rights and remedies of such holders
  until such notes or bonds, together  with  the  interest  thereon,  with
  interest  on  any  unpaid  installments  of  interest, and all costs and
  expenses in connection with any action or proceeding by or on behalf  of
  such  holders,  are fully met and discharged.  The fund is authorized to
  include this pledge and agreement of the state in any agreement with the
  holders of such notes or bonds.