(1) In the event of formation of a combined city and county municipal corporation, as provided for by Article XI, § 16 (Amendment 23) of the Washington constitution, such municipality would be a single municipal corporation for purposes of measuring its limitation upon indebtedness under Article VIII, § 6 (Amendment 27) of the constitution. (2) Article VII, § 1 (Amendment 14) of the Washington constitution would require that taxes levied by such a combined city and county municipal corporation ". . . be uniform upon the same class of property within the territorial limits of . . ." such combined county and city. (3) The legislature, as part of an act providing for the formation of a combined city and county municipal corporation, could authorize the formation of subsidiary units which would be analogous to the community municipal corporations authorized by chapter 73, Laws of 1967.