{"01xxxx", "01", true},
	{"xx01xx", "01", true},
	{"xxxx01", "01", true},
	{"01xxxxx"[1:], "01", false},
	{"xxxxx01"[:6], "01", false},
	// 3-byte needle
	{"xxxxxxx", "012", false},
	{"012xxxx", "012", true},
	{"xx012xx", "012", true},
	{"xxxx012", "012", true},
	{"012xxxxx"[1:], "012", false},
	{"xxxxx012"[:7], "012", false},
	// 4-byte needle
	{"xxxxxxxx", "0123", false},

	b.Run(" X00000|000000 ", func(b *testing.B) { benchmarkErasureEncode(6, 6, 1, 0, size, b) })
	b.Run(" 000000|XXXXX0 ", func(b *testing.B) { benchmarkErasureEncode(6, 6, 0, 5, size, b) })
	b.Run(" XXXXX0|000000 ", func(b *testing.B) { benchmarkErasureEncode(6, 6, 5, 0, size, b) })
}

func BenchmarkErasureEncode_16_40MB(b *testing.B) {
	const size = 40 * 1024 * 1024