What's the rust type for msgpack bin8 type?

```rust
fn test_msgpack() {
#[derive(Deserialize, Serialize, Debug)]
struct A {
a: Vec,
}

// 0x91: array of 1, 0xc4: bin8, 0x01: length, 0x48='H'
let bs = vec![0x91, 0xc4, 0x01, 0x48];

let mut de = Deserializer::new(&bs[..]);

let a: A = Deserialize::deserialize(&mut de).unwrap();
}
```

this test will fail with error: thread 'conn::conn::tests::test_msgpack' panicked at 'called `Result::unwrap()` on an `Err` value: Syntax("invalid type: byte array, expected a sequence")', src/conn/conn.rs:81:54.