how does xray(vless or any proxy protocol) handle both tcp and udp writers

[CyrusTheG]

I am new to this field and was writing a proxy server.tcp based transport was very simple to make,but i was struggling a little to make the proxy work with both tcp and udp transports,I was wondering how does xray handle this?u have diffrent writers for each?my golang is not good but i think u guys made custom wrappers for writer and reader? I am using rust and with tokio u have traits that are only for tcp(or anything that is stream based like file loading) that makes it very simple but udp does not have those traits since it is not stream based
can anyone give me a hint or advise?Thanks

[CyrusTheG]

OK I did some digging and looks like xray only works with whatever that implements io.writer and io.reader so basicly there can't be any unreliabe transports.right?