Projects and proceedings for the issuance of revenue bonds, pledge orders, and other temporary obligations, commenced before July 1, 1981, may be completed as required or permitted by any statute amended or repealed by 1981 Iowa Acts, ch. 117, as though the amendment or repeal had not occurred, and the rights, duties, and interests resulting from the projects and proceedings remain valid and enforceable. Projects commenced prior to July 1, 1981, may be financed by the issuance of revenue bonds, pledge orders, and other temporary obligations under any such amended or repealed law or by the issuance of revenue bonds and pledge orders under this part. For purposes of this section, commencement of a project includes but is not limited to action taken by the board or an authorized officer to fix a date for either a hearing or an election in connection with any part of the project, and commencement of proceedings for the issuance of revenue bonds, pledge orders, and other temporary obligations includes but is not limited to action taken by the board to fix a date for either a hearing or a sale in connection with any part of such revenue bonds, pledge orders, or other temporary obligations or to order any part thereof to be issued.