[boost] [serialization] Calling basic_streambuf::sync in basic_binary_iprimitive destructor

Hi, All! Anybody knows, does we really need to call std::basic_streambuf::sync in boost::archive::basic_binary_iprimitive destructor? Is it possible to not call it? I ask it because the call of sync with file stream buffer leads to skipping of the unreaded input data. I think it is not good, or al least it must be clear described in documentation, that binary_iarchive when used with file stream skips to the end of a stream. Andrey Upadyshev P.S. Sorry for my English