pub(super) fn inner_poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        self.project().inner.poll_write(cx, buf)
    }
Write directly using `inner`, bypassing buffering
futures-util/src/io/buf_writer.rs