Join is relatively trivial using std::stringstream. I'm optimistic that split will be less contentious with C++20 ranges since you can just range-based-for loop

Join is relatively trivial using std::stringstream. I'm optimistic that split will be less contentious with C++20 ranges since you can just range-based-for loop over the split tokens in-place and/or collect them into a container using range mechanisms : best of both worlds.