20479. Notwithstanding any other provision of law, including, but not limited to, Chapter 10 (commencing with Section 3500) of Division 4 of Title 1, no contract or contract amendment shall be made to provide retirement benefits for some, but not all members of the following membership classifications: local miscellaneous members, local police officers, local firefighters, county peace officers, local sheriffs, local safety officers, or school safety members.No contract or contract amendments shall provide different retirement benefits for a subgroup, including, but not limited to, bargaining units or unrepresented groups, within those membership classifications.This section does not preclude changing membership classification from one membership classification to another membership classification or exclusion of groups of members by contract.For purposes of this section, 'benefit' shall not be limited to the benefits set forth in Section 20020.(Amended by Stats. 2009, Ch. 130, Sec. 21. (AB 966) Effective January 1, 2010.)