pkg/flags/selective_string.go
func (ss *SelectiveStringValue) Valids() []string {
	s := make([]string, 0, len(ss.valids))
	for k := range ss.valids {
		s = append(s, k)
	}
	sort.Strings(s)
	return s
}
func (ss *SelectiveStringValue) Valids() []string {
	s := make([]string, 0, len(ss.valids))
	for k := range ss.valids {
		s = append(s, k)
	}
	sort.Strings(s)
	return s
}
// Valids returns the list of valid strings.