> >> > both of them can take longer than a few weeks.
> >> 
> >> Do you have an idea of how long they will take?
> >
> > 1 month for each of them.
> > (just a rough guess, of course)
> >
> > how long will your style cleanups take, otoh?
> 
> They can be done very quickly -- a couple of days at most. The problem
> is making sure we do the right ones -- causing trouble for people has
> to be minimized. Thinking carefully about it is the time consuming
> step, not doing the changes themselves.
> 
> Perry

ok, then, how about:
	1. you revert unnecessary changes after a couple of weeks
	   as you said.
	2. then, i create a branch.
	3. while i'm working on the branch, you can do your
	   "time consuming step".
	4. once i merge or abandon the branch, you'll do the
	   "changes themselves".

YAMAMOTO Takashi