Enum discriminant is not serialized when specified

[encody]

The specification says that for serializing enums, the pseudocode procedure is as follows:

Suppose X is the number of the variant that the enum takes.
repr(X as u8)
repr(x.X as fieldsX)

Therefore, I would expect the following code to work:

#[derive(BorshSerialize)]
enum MyEnum {
    A = 20,
}

assert_eq!(MyEnum::A as u8, 20);
assert_eq!(MyEnum::A.try_to_vec().unwrap(), vec![20]);

However, it fails:

running 1 test
thread 'x' panicked at 'assertion failed: `(left == right)`
  left: `[0]`,
 right: `[20]`', src/lib.rs:10:5

It is serialized the same as if the discriminant were not specified:

#[derive(BorshSerialize)]
enum MyEnum2 {
    A,
}

assert_eq!(
    MyEnum2::A.try_to_vec().unwrap(),
    MyEnum::A.try_to_vec().unwrap(),
);

[frol]

@encody The specification denotes the type of the field, not the fact that as u8 conversion will be used. That said, it might be worth considering adding this feature support. I am happy to review a PR if anyone will submit one.