docs: private static int calcLongStrLength(long posValue)
      {
          int len = 10;
          long comp = TEN_BILLION_L;
  
          // 19 is longest, need to worry about overflow
          while (posValue >= comp) {
              if (len == 19) {
                  break;
              }
              ++len;
              comp = (comp << 3) + (comp << 1); // 10x
          }
          return len;
      }