Re: [boost] [review][fixed_string] End of review period approaching and a plea

I would hope to see close to the same semantics as std::array, which I believe allows data() to return nullptr.

I don't think so: "There is a special case for a zero-length array (|N == 0|). In that case, array.begin() == array.end(), which is some unique value. The effect of calling front() or back() on a zero-sized array is undefined." from https://en.cppreference.com/w/cpp/container/array IMO this excludes nullptr as that won't be unique