code: func NewQuery(feed *Feed, time uint64, hint lookup.Epoch) *Query {
  	return &Query{
  		TimeLimit: time,
  		Feed:      *feed,
  		Hint:      hint,
  	}
  }
docs: // NewQuery constructs an Query structure to find updates on or before `time`
  // if time == 0, the latest update will be looked up