func indexBytePortable(s []byte, c byte) int {
	for i, b := range s {
		if b == c {
			return i
		}
	}
	return -1
}

func BenchmarkIndexBytePortable(b *testing.B) {
	benchBytes(b, indexSizes, bmIndexByte(indexBytePortable))
}

func bmIndexByte(index func([]byte, byte) int) func(b *testing.B, n int) {
	return func(b *testing.B, n int) {