code: func decodeSkipNoRefs(p *advRefsDecoder) decoderStateFn {
  	if len(p.line) < len(noHeadMark) {
  		p.error("too short zero-id ref")
  		return nil
  	}
  
  	if !bytes.HasPrefix(p.line, noHeadMark) {
  		p.error("malformed zero-id ref")
  		return nil
  	}
  
  	p.line = p.line[len(noHeadMark):]
  
  	return decodeCaps
  }
docs: // Skips SP "capabilities^{}" NUL