docs: public void addWithOverflow(PagedBitMap that, PagedBitMap overflow) {
          LongArray ta = that.array;
          LongArray of = overflow.array;
          long n = 0;
          while(true) {
              n = ta.seekNext(n);
              if (n < 0) {
                  break;
              }
              long o = array.get(n) & ta.get(n);
              long v = array.get(n) | ta.get(n);
              array.set(n, v);
              if (o != 0) {
                  o |= of.get(n);
                  of.set(n, o);
              }
              ++n;
          }
      }