// proceed independently on both sides:
// f(x) == append(f(x[0:n]), f(x[n:])...)
//
-// References: http://unicode.org/reports/tr15/ and
-// http://unicode.org/notes/tn5/.
+// References: https://unicode.org/reports/tr15/ and
+// https://unicode.org/notes/tn5/.
type Form int
const (