code: static int positionValue(Encoding enc, int i) {
          if (i < ByteValTable.length) {
              if (i == 0 && enc.minLength() > 1) {
                  return 20;
              } else {
                  return ByteValTable[i];
              }
          } else {
              return 4; /* Take it easy. */
          }
      }
docs: map_position_value