[boost] Big integer library

Tracking the disussion on n1774 'Big integer library proposal for C++0x' I see there is a lot of controversy about it, and it will probably need much tweaking before (if ever) it is accepted. Wouldn't that be a good idea to have a big integer added to boost so that we can create a 'working practice' before anything gets standarised? I have some preliminary source code, some spare time, and would volunteer to work on it if there's enough interest. cheers, M.