In any instance in which the Legislature, by general or local act, has provided for or authorized the levy and collection within any county or municipality of a tax, other than an ad valorem tax, for school purposes, herein called a “special school tax,” and has specified that the authority for the levy of such special school tax shall terminate upon the payment in full of certain generally or specifically described bonds, warrants, or other obligations, herein called “original obligations,” if other bonds, warrants, or other obligations, herein called “refunding obligations,” are issued to provide for the payment or redemption of some or all of the original obligations or any previously issued refunding obligations, the authority for the levy and collection of the special school tax shall continue until the payment in full of all refunding obligations. As used herein, the term “refunding obligations” includes bonds, warrants, or other obligations issued for multiple purposes, so long as one of those purposes is to provide for the payment or redemption of some or all of the original obligations or any previously issued refunding obligations.