So you can turn something like:
```rs
#[derive(miniconf::Tree)]
struct Settings {
    a: u32,
    b: heapless::String<64>,
    c: smoltcp::SocketAddress,
}
```

Into:
```rs
("/a", b"100"), ("/b", b"my_string"), ("/c", "192.168.1.1:2000")
```