Breaking Changes
send_vectoredrenamed tosendv.
Added
sendv_allto write an entire vectored buffer to a writer.
use std::io::IoSlice;
let buf1 = b"part1";
let buf2 = b"part2";
let bufs = &mut [IoSlice::new(buf1), IoSlice::new(buf2)];
tun.sendv_all(bufs).await?;