> I'm not sure binary protocols are any better, unless you make the first two bytes of every message a version number. Actually we've seen people manage to fu

> I'm not sure binary protocols are any better, unless you make the first two bytes of every message a version number. Actually we've seen people manage to fuck that up royally, too. Examples: Routers confusing MAC addresses starting with "6" with IPv6 packets. Various TLS implementations in proxies falling completely apart when they see an unknown version. Various TLS proxies falling apart when seeing an unknown extension. Far too many instances of "assert version==1" to list.