(a) No action shall be brought directly or indirectly attacking, questioning, or in any manner contesting the legality or validity of municipal revenue bonds for public utility purposes, issued or unissued, voted by any municipality or by any other municipal corporate entity, after six months from the date upon which voters in any such municipality or other municipal corporate entity met pursuant to warning and voted affirmatively to issue bonds to defray costs of municipal utility purposes or upon vote of a question of recission thereof whichever occurs later.

(b) This section shall be liberally construed to effect the legislative purpose to validate bonds issued or authorized by municipalities or other municipal corporate entities for public utility purposes, and to bar every right to question in any manner the validity of a bond voted by it for public utility purposes, and to bar every remedy therefor notwithstanding any defects or irregularities, jurisdictional or otherwise, after expiration of the six-month period. (Added 1975, No. 57, § 2, eff. April 18, 1975.)