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https://svn.boost.org/trac/boost/ticket/12577#comment:1
static_vector<>::static_capacity
                  to use the configured capacity in constant expressions.
                insert_or_assign/try_emplace for map
            and flat_map.
          map,
            multimap, set, multiset.
          deque,
            vector, stable_vector, small_vector,
            static_vector, list and slist.
          boost::container::small_vector
            supports more constructors and assignments.
          pop_back, pop_front, back,
            front, etc.)
          back/front operations to basic_string.
          small_vector
            container.
          nth and index_of functions to containers with
            random-access iterators (except basic_string).
          allocator_traits<Allocator>::is_always_equal.
          scoped_allocator_adaptor's
            propagate_on_container_copy_assignment,
            propagate_on_container_move_assignment
            and propagate_on_container_swap
            are no longer ::boost::integral_constant<bool, true/false> types. The dependency reorganization
            needed to break with those classes to avoid MPL dependencies, and interoperability
            with std::integral_constant was not guaranteed.
            Code assumming boost::true_type/boost::false_type
            on this will not compile. As a workaround, use the guaranteed internal
            ::value
            constant: ::boost::integral_constant<bool, scoped_allocator_adaptor<Allocator>::propagate_on_container_move_assignment::value>.
          initializer_list.
            Contributed by Robert Matusewicz.
          set, multiset,
            map and multimap.
          static_vector
            class, based on Andrew Hundt's and Adam Wulkiewicz's high performance
            varray class.
          vector
            constructors/copy/move/swap, dispatching to memcpy when possible.
          BOOST_NO_EXCEPTIONS
            #7227.
          vector's insertion
            performance.
          stable_vector's
            template code bloat and type safety.