Expand description
Provides a “legacy” version of SSZ encoding for Option<T> where T: Encode + Decode.
The SSZ specification changed in 2021 to use a 1-byte union selector, instead of a 4-byte one which was used in the Lighthouse database.
Users can use the four_byte_option_impl macro to define a module that can be used with the
#[ssz(with = "module")].
§Example
use ssz_derive::{Encode, Decode};
use ssz::four_byte_option_impl;
four_byte_option_impl!(impl_for_u64, u64);
#[derive(Encode, Decode)]
struct Foo {
#[ssz(with = "impl_for_u64")]
a: Option<u64>,
}