Function convertToJson

extras/tests/Misc/issue2129.cpp:39–45

template <typename T>
void convertToJson(const Nullable<T>& src, JsonVariant dst) {
  if (src.is_valid()) {
    dst.set(src.value());
  } else {
    dst.clear();
  }
}

TEST_CASE("Issue #2129") {
  Nullable<float> nullable_value = Nullable<float>{123.4f};