Except as provided in Sections 21612 (omitted spouse) and 21623 (omitted children) and in Division 10 (commencing with Section 20100) (proration of taxes), shares of beneficiaries abate as provided in this part for all purposes, including payment of the debts, expenses, and charges specified in Section 11420, satisfaction of gifts, and payment of expenses on specifically devised property pursuant to Section 12002, and without any priority as between real and personal property.