docs: public final Timestamp addMillis(long amount)
      {
          if (amount == 0 && _precision.includes(Precision.SECOND) && _fraction != null && _fraction.scale() >= 3) {
              // Zero milliseconds are to be added, and the precision does not need to be increased.
              return this;
          }
          return addMillisForPrecision(amount, Precision.SECOND, true);
      }