- Check VERY thoroughly for memory leaks in our usage of the FFI over OpenSSL.

- Figure out the following, observed while flooding the server with
  cat /dev/zero piped into ssh localhost -p 2322:

    Seg fault (internal error) at 0x4
    Bus error

  After a while it crashes out like that. Or seems to deadlock.

- Figure out what the rules for packet size limit really are. Is it
  payload limit or what? Why does OpenSSH give us these large packets
  sometimes?

- Buffer outbound traffic during rekey so we don't try to talk between
  KEXINIT and NEWKEYS