message: construction: fixed a warning
diff: @@ -668,7 +668,7 @@ TEST_CASE("custom serializer that does adl by default", "[udt]")
  {
  using json = nlohmann::json;
  - auto me = udt::person{23, "theo", udt::country::france};
  + auto me = udt::person{{23}, {"theo"}, udt::country::france};
  json j = me;
  custom_json cj = me;
  