#[derive(bincode::Encode)]
struct DefaultGenerics<T = String> {
    inner: T,
}
#[test]
fn test_default_generics() {
    let generics = DefaultGenerics {
        inner: String::from("Hello world"),
    };
    let bytes = bincode::encode_to_vec(&generics, bincode::config::legacy()).unwrap();
    assert_eq!(
        bytes,
        &[11, 0, 0, 0, 0, 0, 0, 0, 72, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]
    );
    let generics = DefaultGenerics {
        inner: 0xDEADBEEFu32,
    };
    let bytes =
        bincode::encode_to_vec(&generics, bincode::config::legacy().with_big_endian()).unwrap();
    assert_eq!(bytes, &[0xDE, 0xAD, 0xBE, 0xEF],);
}