code: func (s *Store) insertCollectionName(name string) []string {
  	sidx := sort.SearchStrings(s.collNames, name)
  	r := make([]string, 0, len(s.collNames)+1)
  	return append(append(append(r, s.collNames[:sidx]...), name), s.collNames[sidx:]...)
  }
docs: // insertCollectionName returns a copy of s.collNames with name inserted
  // in its appropriate sorted position.