code: func (c *confirms) Multiple(confirmed Confirmation) {
  	c.m.Lock()
  	defer c.m.Unlock()
  
  	for c.expecting <= confirmed.DeliveryTag {
  		c.confirm(Confirmation{c.expecting, confirmed.Ack})
  	}
  	c.resequence()
  }
docs: // multiple confirms all publishings up until the delivery tag