All bonds, notes or other obligations heretofore or hereafter issued by the municipalities of the state, for so much of the cost of the local improvements as shall have been or shall be assessed against property specially benefited by said improvements or shall have been paid for by said issuing municipality, shall be excepted from any limitations of indebtedness prescribed by the special charters of such municipalities or by any special or general law, and said bonds, notes or other obligations shall not be considered indebtedness of said municipalities in applying said limitations of indebtedness. It shall not be necessary for any municipality to secure the approval of its qualified electors to borrow the money or issue its obligations incurred in the doing of such local improvements, but such acts may be done without an election and without giving notice of intention to do so.
