code: func BytesToTopic(b []byte) (t TopicType) {
  	sz := TopicLength
  	if x := len(b); x < TopicLength {
  		sz = x
  	}
  	for i := 0; i < sz; i++ {
  		t[i] = b[i]
  	}
  	return t
  }
docs: // BytesToTopic converts from the byte array representation of a topic
  // into the TopicType type.