Such bonds shall be authorized by a resolution to be adopted by the county board or the board of county commissioners (as the case may be). Said resolution shall describe the principal, interest or both, to be paid, fix the details of the refunding bonds, including the date, denominations, place of payment, rate of interest and maturity of the bonds so authorized to be issued pursuant to the provisions of this Division, and such resolution shall provide for the levy of a tax sufficient to pay principal of and interest on said refunding bonds as the same mature. The refunding bonds shall bear interest at a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable annually or semiannually, and may mature at such time or times, (but not more than twenty years from date of bonds) as the resolution shall fix. Such bonds shall be signed by the Chairman of the Board, be attested by the County Clerk with the seal of the County attached, and be registered by the County Treasurer. The coupons attached to said bonds may be executed with the lithographed or facsimile signature of the County Treasurer.
     With respect to instruments for the payment of money issued under this Section or its predecessor either before, on, or after the effective date of Public Act 86-4, 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 Division or “An Act to authorize counties having a population of less than two hundred thousand to issue refunding bonds”, approved April 22, 1933, that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section or its predecessor are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section or its predecessor within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Division or “An Act to authorize counties having a population of less than two hundred thousand to issue refunding bonds”, approved April 22, 1933, that may appear to be or to have been more restrictive than those Acts.