> <@jamesmunns:beeper.com> I'm also working on `postcard-rpc`, if you are specifically doing it so you can send a bunch of different commands/requests to a device, and to know what type it will respond with

 * Hmm, it's not obvious to me in this example, but I would expect `&[0x01, 0x10, 0x02, 0x20, b'h', b'E', b'l', b'L', b'o',]` - why the extra padding?

```rust
#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
struct RefStruct<'a> {
    bytes: &'a [u8],
    str_s: &'a str,
}
let message = "hElLo";
let bytes = [0x01, 0x10, 0x02, 0x20];
let output: Vec<u8, 11> = to_vec(&RefStruct {
    bytes: &bytes,
    str_s: message,
}).unwrap();

assert_eq!(
    &[0x04, 0x01, 0x10, 0x02, 0x20, 0x05, b'h', b'E', b'l', b'L', b'o',],
    output.deref()
);
```