Function convert

Bcore/src/main/cpp/Dobby/tests/catch.hpp:7728–7730

};

template <typename T> auto convert(T t) -> Converter<T> {
  return Converter<T>(t);
}

template <typename FP> bool almostEqualUlps(FP lhs, FP rhs, int maxUlpDiff) {
  // Comparison with NaN should always be false.