code: @Override
    public boolean removeAll(IntSet c)
    {
      modCount++;
  
      if (c == null || c.isEmpty() || isEmpty()) {
        return false;
      }
      if (c == this) {
        clear();
        return true;
      }
  
      ConciseSet other = convert(c);
      if (other.size == 1) {
        return remove(other.last);
      }
  
      return replaceWith(performOperation(convert(c), Operator.ANDNOT));
    }
docs: {@inheritDoc}