<JamesSizeland[m]> "I'd expect this to work, but..." <- > <@jsizeland:matrix.org> I'd expect this to work, but it errors on the Vec being empty
> ```rust
> #![no_std]
> 
> #[cfg(test)]
> mod tests {
> 
>     use heapless::Vec;
>     use bincode::{config, Decode, Encode};
> 
>     #[derive(Encode, Decode, PartialEq, Debug)]
>     struct Entity {
>         x: u32,
>         y: u32,
>     }
> 
>     #[test]
>     fn encode_bytes() {
>         let config = config::standard();
>         let mut dst: Vec<u8, 256> = Default::default();
>         let val = Entity { x: 1, y: 2 };
> 
>         bincode::encode_into_slice(val, &mut dst, config).unwrap();
>         assert_eq!(dst.len(), 8);
>     }
> }
> ```

You could use an array of zeroes, and write to that, or you could pre-fill the heapless Vec with zeros, and then trim it once the bincode write is done. Or you could make a wrapper type and implement bincode::enc::write::Writer on the wrapper type and have the wrapper write to an inner heapless::Vec.