[boost] [serialization] New version number in 1.34

The serialization::archive in Boost 1.34 has been bumped to 4. That isn't mentioned in the documentation (actually, there isn't a "new in 1.34" section in the changes docs, or any docs on changes since 2004). Secondly, is there any way to get this version to output 3? I'm pretty sure the answer is no, but the differences in my file are not important, and it is causing some problems with old code, so I was hoping there might be something I missed. Otherwise, has anyone tried using the old Serialization library in Boost 1.33? Thanks, Jared