Once these middlebox vendors catch up to TLS 1.3, what's to stop them from breaking the supported versions extension the same way they broke the client version field? Anyone know if Chrome is using/planning to use GREASE with this extension? (Couldn't find anything about it on Google.)
> Once these middlebox vendors catch up to TLS 1.3, what's to stop them from breaking the supported versions extension the same way they broke the client version field
Nothing. It will happen just the same, so TLS 1.4 will have a “actually, this is the extension to use to determine the version”-extension
