id summary reporter owner description type status milestone component version severity resolution keywords cc 11829 Order of elements with same key in multimap not preserved boost@… Robert Ramey "The hinting in load_map_collection from boost/serialization/map.hpp destroys the relative order of elements with the same key. Since C++11 one can reconstruct multimaps where the elements preserve the original order. However, one has to use the multimap insertions without hinting. A quick fix would be to drop hinting for multimaps whereas for maps it can still be used. Possibly also hinting with the end pointer would work. " Bugs closed To Be Determined serialization Boost 1.59.0 Problem fixed