code: func (b *Bitmap) Any() bool {
  	iter, _ := b.Containers.Iterator(0)
  	// TODO (jaffee) I'm not sure if it's possible/legal to have an empty
  	// container, so this loop may be totally unnecessary. In theory, any empty
  	// container should be removed from the bitmap though.
  	for iter.Next() {
  		_, c := iter.Value()
  		if c.n > 0 {
  			return true
  		}
  	}
  	return false
  }
docs: // Any returns "b.Count() > 0"... but faster than doing that.