Known limitations

No SK/FIDO support.
No DNS support.
No proxy support.
Assumes SSH2.0 for now.
Cannot determine compatibility flags. This means there may be some weird bugs when connecting to certain SSH implementations.
SSHD does not work as it requires socketpair. It will start, but will crash on connection.

Note on connecting to servers

You have to specify the port number when using ssh. It seemingly doesn't default to 22.