Be it further enacted, That negotiable bonds secured by the general faith and credit of the city, or solely by specific property owned by the city, or solely by the credit of any public utility owned or operated by the city, or solely by any non-tax revenue sources of the city, or by any two or more such assets or revenue, may be issued by the city for such purposes as acquiring land; purchasing, constructing, reconstructing, or extending waterworks, sewers, sewage treatment plants, public ways, motor vehicular parking facilities, fire alarm systems, fire equipment and buildings, gas utility works, electric utility works, public transportation facilities and terminals, power plants, any other public utility, street lights, police equipment, hospitals, jails, workhouses, libraries, charitable institutions, corrective institutions, penal institutions, other public buildings, parks, playgrounds, public grounds or squares, and any other public improvements which the city may be authorized or permitted to make; purchasing real or personal property for school purposes; constructing or purchasing school buildings and equipment; and for repaying, refunding, or removing any bonded indebtedness of the city. The foregoing enumeration is cumulative to other provisions of law and shall not be construed to limit or modify the purposes in this Act or any other general law for which the city may borrow money or issue and sell its bonds.