All bonds heretofore issued by any public body for any purpose and in any manner consistent with the constitution of the state, and all proceedings heretofore taken by any such body for the authorization, issuance, sale, exchange, execution, and delivery of its bonds, and for the performance of any conditions precedent thereto, and for the provision of taxes, special assessments, and other funds to pay such bonds and interest thereon, are hereby validated, ratified, approved, and confirmed, notwithstanding any lack of power of such public body, or of the governing board, council, commission, or officers thereof, to authorize, issue, sell, exchange, execute, or deliver the same, and notwithstanding any defects, irregularities, or omissions in such proceedings or in such authorization, issuance, sale, exchange, execution, or delivery; and all bonds heretofore issued by such public bodies, and all bonds hereafter issued by them under the authority of proceedings heretofore taken are binding, legal, and enforceable obligations of such public bodies respectively.