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Hixie points out here that I'll have to do this: http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-August/032987.html
Basically, we need to define what the undo/redo implications are for all the commands and user-triggered actions.
I added a minimal reference: http://dvcs.w3.org/hg/editing/rev/f9482026cd03 I don't see anything else specific I need to do right now here.