This article shall be liberally construed to accomplish the purpose of providing reasonable, economical and expeditious means for municipalities to provide permanent improvements and to assure to the contractors making such improvements, or persons directly or indirectly financing the same, security in the payment of the cost and expense of such improvements; and nothing in this article shall be construed as imposing a time limit on a certificate holder or bondholder for the enforcement of his rights.
Moreover, the validity and enforcement of the assessments in this article provided shall not be impaired by the issuance and sale of bonds, as provided in article one of chapter thirteen of this code, for the same improvements, nor by the application, in whole or in part, of the proceeds of any such bond issue to the cost of any such improvement prior to collection of said assessments.