Issuance by the authority of one or more series of bonds or other forms of indebtedness shall not preclude it from issuing other bonds or other forms of indebtedness in connection with the same purpose or any other purpose hereunder, but the bond resolution whereunder any subsequent bonds or other forms of indebtedness may be issued shall recognize and protect any prior pledge made for any prior issue of bonds or other forms of indebtedness. Any issue of bonds or other forms of indebtedness of the authority at any time outstanding may be refunded at any time and from time to time by the authority by the issuance of its refunding bonds or other forms of indebtedness in such amount as the authority may deem necessary, but not exceeding the amount sufficient to refund the principal of the bonds or other forms of indebtedness so to be refunded together with any unpaid interest thereon and any premiums, commissions, service fees, and other expenses necessary to be paid in connection with the refunding. Any such refunding may be effected whether the bonds or other forms of indebtedness to be refunded then shall have matured or thereafter shall mature, either by sale of the refunding bonds or other forms of indebtedness and the application of the proceeds thereof to the payment of the bonds or other forms of indebtedness being refunded or by the exchange of the refunding bonds or other forms of indebtedness for the bonds or other forms of indebtedness being refunded with the consent of the holder or holders of the bonds or other forms of indebtedness being refunded, regardless of whether or not the bonds or other forms of indebtedness being refunded were issued for the same purpose or any other purpose hereunder and regardless of whether or not the bonds or other forms of indebtedness proposed to be refunded shall be payable on the same date or different dates or shall be due serially or otherwise.