The other night I was trying to follow the Implement DNS in a weekend course in Mojo. In the course they use struct.pack to make the byte array for the DNS query. Since Mojo has actual sized int types, it might make more sense to have a protocol that describes conversion to and from bytes. One particular caveat is byte ordering, so if this protocol were added it would probably have a to_le_bytes() and to_be_bytes() (though one could possible be inferred from the other).