support num-bigint-dig crates ?

[CrayfishGo]

I used num-bigint-dig instead of num-bigint。

In my Cargo.toml

num-bigint = { version = "0.8.1", features = ["i128", "u64_digit"], default-features = false, package = "num-bigint-dig" }

Below is my code

    let cipher = encrypt(data, public_key);
    let x = BigUint::from_bytes_be(&cipher[0..32]);
    let y = BigUint::from_bytes_be(&cipher[32..64]);
    let sm3 = &cipher[64..96];
    let secret = &cipher[96..];
    yasna::construct_der(|writer| {
        writer.write_sequence(|writer| {
            writer.next().write_biguint(&x);
            writer.next().write_biguint(&y);
            writer.next().write_bytes(&sm3);
            writer.next().write_bytes(&secret);
        });
    })

But the method write_biguint dose not support num-bigint-dig::BigUnit.

So How to make it work？