[Vinay Sajip]
> I don't think the ways of doing this are bulletproof and 
> require too much cooperation between third-party libraries.

I concur with all of Vinay's comments.  

If logging were being redesigned from scratch, it would likely use new-style formatting everywhere.  But, it is already deployed and widely adopted.  Trying to make it support two-ways-to-do-it would likely create more problems than it solves.

Vinay, do you want to reject and close this proposal?