The authority granted by the Public Securities Short-Term Interest Rate Act shall be liberally construed so that the purposes and powers provided for may be carried out in effective, efficient and convenient manners by public bodies. The authority granted by that act is supplemental to and provides alternatives for authority granted by other law, and a public body shall have the authority to exercise powers under that act notwithstanding inconsistent provisions of other laws, or may elect to use the authority of that act in part and the authority of other laws in part with respect to an issue of bonds. Home rule municipalities may, at their option, use the provisions of that act for any bonds they are authorized to issue, but nothing herein shall be deemed to restrict their home rule powers.