improved fmt support

Author: arBmind

src/strong19.lib/strong19/Strong.fmt.h

@@ -10,6 +10,6 @@ template<class T, class Char> requires(strong19::is_strong<T>) struct fmt::forma
     constexpr auto parse(fmt::basic_format_parse_context<Char>& ctx) { return ctx.begin(); }
 
     template<typename FormatContext> auto format(const T& v, FormatContext& ctx) {
-        return fmt::format_to(ctx.out(), "{} [{}]", v.v, strong19::strong_name<T>);
+        return fmt::format_to(ctx.out(), "{}{{{}}}", strong19::strong_name<T>, v.v);
     }
 };

src/tuple19.lib/tuple19/Tuple.fmt.h

@@ -26,9 +26,10 @@ template<class... Ts, class Char> struct fmt::formatter<tuple19::Tuple<Ts...>, C
             return fmt::format_to(ctx.out(), "Tuple<>");
         }
         else {
-            [&]<size_t... Is>(std::index_sequence<0, Is...> const&) {
-                fmt::format_to(ctx.out(), "{}", v.template at<0>());
-                (fmt::format_to(ctx.out(), ", {}", v.template at<Is>()), ...);
+            return [&]<size_t... Is>(std::index_sequence<0, Is...> const&) {
+                auto out = fmt::format_to(ctx.out(), "{}", v.template at<0>());
+                ((out = fmt::format_to(out, ", {}", v.template at<Is>())), ...);
+                return out;
             }
             (std::make_index_sequence<sizeof...(Ts)>{});
         }