docs: public static String doubleToGoString(double d) {
      if (d == Double.POSITIVE_INFINITY) {
        return "+Inf";
      } 
      if (d == Double.NEGATIVE_INFINITY) {
        return "-Inf";
      }
      if (Double.isNaN(d)) {
        return "NaN";
      }
      return Double.toString(d);
    }