b.Run(fmt.Sprintf("IndexPeriodic%d", skip), func(b *testing.B) {
			s := Repeat("a"+Repeat(" ", skip-1), 1<<16/skip)
			for i := 0; i < b.N; i++ {
				Index(s, key)
			}
		})
	}
}

func BenchmarkJoin(b *testing.B) {
	vals := []string{"red", "yellow", "pink", "green", "purple", "orange", "blue"}
	for l := 0; l <= len(vals); l++ {
		b.Run(strconv.Itoa(l), func(b *testing.B) {
			b.ReportAllocs()