Mark Dickinson wrote:
> The trailing zeros thing is heavily bound up with issue 5858, of course;
> I think we need a decision on that, one way or the other.  One problem
> is that I'm only proposing the issue 5858 change for py3k, not trunk.

I don't have a problem with trunk's complex.__format__ not agreeing with 
trunk's complex.__str__. If it's a big deal, we can just take 
complex.__format__ completely out of trunk with a #define. In any event, 
there's lots of time before 2.7 and not so much before 3.1, so let's 
concentrate on trunk. Which is what I should have done with starting 
this issue (but forward porting is easier for me that back porting).