Interface ToCbor

The structural encode protocol: types that can convert themselves to CBOR. cbor() dispatches on it, following the toJSON precedent.

Tagged types conventionally also keep cborTags() / untaggedCbor() / taggedCbor() as ordinary members and implement toCbor() as return this.taggedCbor();.

interface ToCbor {
toCbor(): Cbor;
}