(a) A home-rule municipality may issue bonds on the credit of the municipality to make permanent public improvements or for another public purpose in the amount and to the extent provided by its charter.
(b) A home-rule municipality may not issue bonds under this section unless the bonds have been authorized by a majority of the qualified voters of the municipality voting at an election held for that purpose.
(c) If a municipality was authorized under a special charter granted before June 30, 1913, to issue bonds, this section may not be construed as interfering with the issuance of bonds under that charter.