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+====== String_view for objects with a const string field ======
+Store a little string in an object which is going to be its name. It can't change its name, so it ought to be const. Prefer not to use std::string - it's heavyweight, and the data ends up on a separate string allocation.
+<code c++>
+struct Str {
+    constexpr Str(std::string_view s) : buf{[&]{
+        auto buf = std::array<char, 64>{};
+        std::copy(s.begin(), s.end(), buf.data());
+        return buf;
+    }()}, sv{buf.data()} {}
+    std::array<char, 64> const buf;
+    std::string_view const sv;
+};
+</code>