pkg/types/urlsmap.go
func (c URLsMap) String() string {
	var pairs []string
	for name, urls := range c {
		for _, url := range urls {
			pairs = append(pairs, fmt.Sprintf("%s=%s", name, url.String()))
		}
	}
	sort.Strings(pairs)
	return strings.Join(pairs, ",")
}
func (c URLsMap) String() string {
	var pairs []string
	for name, urls := range c {
		for _, url := range urls {
			pairs = append(pairs, fmt.Sprintf("%s=%s", name, url.String()))
		}
	}
	sort.Strings(pairs)
	return strings.Join(pairs, ",")
}
// String turns URLsMap into discovery-formatted name-to-URLs sorted by name.