code: func (bv *BitVector) InvertAll() {
  	if bv.count != -1 {
  		bv.count = bv.size - bv.count
  	}
  	if len(bv.bits) > 0 {
  		for idx, v := range bv.bits {
  			bv.bits[idx] = byte(^v)
  		}
  	}
  }
docs: /* Invert all bits */