// '&' to '&'.
func urlNormalizer(args ...any) string {
	return urlProcessor(true, args...)
}

// urlProcessor normalizes (when norm is true) or escapes its input to produce
// a valid hierarchical or opaque URL part.
func urlProcessor(norm bool, args ...any) string {
	s, t := stringify(args...)
	if t == contentTypeURL {
		norm = true
	}
	var b strings.Builder