The treasurer of the municipal corporation or his or her designee shall have such additional powers as are necessary to effectuate the purposes of this act. This act supersedes any existing general or special law or charter provision with respect to the matters contained herein as they apply to the issuance of bonds, notes, or certificates but shall not diminish or restrict any powers heretofore granted by law. (Added 1983, No. 24, § 1, eff. April 6, 1983.)