fails:TCPServer#sysaccept using IPv4 with a connected client returns a new file descriptor as a Fixnum
fails:TCPServer#sysaccept using IPv6 with a connected client returns a new file descriptor as a Fixnum
fails:TCPServer#sysaccept using IPv4 with a connected client returns a new file descriptor as an Integer
fails:TCPServer#sysaccept using IPv6 with a connected client returns a new file descriptor as an Integer
