empty byte returns byte array of zero

[imerkle]

        let y: &[u8] = &[];

        println!("{:?}", bincode::serialize(b"").unwrap()); //[]
        println!("{:?}", bincode::serialize(y).unwrap()); //[0,0,0,0,0,0,0,0]

      assert_eq!(bincode::serialize(b"").unwrap(), bincode::serialize(y).unwrap()); //false

[nox]

b"" is a &[u8; 0] whose size is statically known and thus doesn't need to be serialised, whereas y is a &[u8] which serialises to just its length 0. This behaviour is expected.