code: func setHasItemOrAll(s sets.String, item string) bool {
  	if s.Has("all") || s.Has(strings.ToLower(item)) {
  		return true
  	}
  	return false
  }
docs: // setHasItemOrAll is helper function that return true if item is present in the set (case insensitive) or special key 'all' is present