title: What is consteval?
body: <p>Apparently, <code>consteval</code> is going to be a keyword in C++20. The <a href="https://en.cppreference.com/w/cpp/keyword/consteval" rel="noreferrer">cppreference page</a> for it is currently blank. What is it going to be and how does it relate to <code>constexpr</code>?</p>