code: func (b *Bitmap) Max() uint64 {
  	if b.Containers.Size() == 0 {
  		return 0
  	}
  
  	hb, c := b.Containers.Last()
  	lb := c.max()
  	return hb<<16 | uint64(lb)
  }
docs: // Max returns the highest value in the bitmap.
  // Returns zero if the bitmap is empty.