0.12.2dev: Follow-up to [10342], with a slightly better way of waling the MRO.
0.12.2dev: Follow-up to [10342], with a slightly better way of waling the MRO.

Part of #9870.


git-svn-id: 764b04d0c6fbbea0ee05220aef3208173ff13049@10343 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac