@Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;

      RevisionPack that = (RevisionPack) o;

      return myRevision.equals(that.getRevision());
    }
 public boolean contains(final RevisionPack previous) {
   if (myRevision.equals(previous.getRevision()) && !myRevision.equals(VcsRevisionNumber.NULL))
     return true;
   return myNumber >= previous.getNumber();
 }