[boost] [serialization] Is no_tracking from archive_flags working?

Is no_tracking flag of archives supposed to work? It is defined in archive_flags enum, but all the code that tests it in serialization library is commented out. Unfortunately, even if I uncomment all the code, tracking still performed. I need to disable tracking on per-archive basis and this flag would be just the solution, if I could make it work. (the only references to no_tracking flag I found are in iserializer.hpp and oserializer.hpp). thank you, Marcin