code: func (q *EvictingStringQueue) PeekAllSet() map[string]bool {
  	all := q.PeekAll()
  	set := make(map[string]bool)
  	for _, v := range all {
  		set[v] = true
  	}
  
  	return set
  }
docs: // PeekAllSet returns PeekAll as a set.