docs: private int correctForExpungedMessages(int absoluteMsn) {
          int correctedMsn = absoluteMsn;
          // Loop through the expunged list backwards, adjusting the msn as we go.
          for (int i = expungedMsns.size() - 1; i >= 0; i--) {
              int expunged = expungedMsns.get(i);
              if (expunged <= absoluteMsn) {
                  correctedMsn++;
              }
          }
          return correctedMsn;
      }