A determination by the governing body that any refunding is advantageous or necessary to the local government, or that any of the amounts provided in § 9-21-1004 should be included in such refunding, or that any of the outstanding obligations should be called for redemption on the first or any subsequent available redemption date or permitted to remain outstanding until their respective dates of maturity, shall be conclusive.
T.C.A. § 9-21-1002