Macro impl_to_byte_array_for_array

macro_rules! impl_to_byte_array_for_array {
    ($t:ty, $( $len:literal => [$($index:tt),*] );* $(;)?) => { ... };
}

Example usage: impl_to_byte_array_for_array! { MyCustomType, 1 => [0], 2 => [0, 1] }