[boost] [Boost.Range] missing set insertion

Something like this works when my destination is a vector: boost::range::push_back (destV, some_range); but there doesn't seem to be anything to use when the destination is a set. The obvious boost::range::insert (destS, some_range); complains that I don't have enough arguments for insert. Looking at the implementation in range/algorithm_ext/insert.hpp, it seems like an overloaded function without the "before" argument ought to work on any container that has a .insert(InputIt first, InputIt last ); member function, specifically including std::set and boost::container::flat_set. Is there some technical reason why this isn't supported? If not, I'd like to see what it takes to get it added. —John