Hi TLS,
Appendix B.3 defines the `HandshakeType` for each message in the handshake
protocol. I'm curious about the history of the RESERVED variants in this
list:
```
enum {
hello_request_RESERVED(0),
client_hello(1),
server_hello(2),
hello_verify_request_RESERVED(3),
new_session_ticket(4),
end_of_early_data(5),
hello_retry_request_RESERVED(6),
encrypted_extensions(8),
certificate(11),
server_key_exchange_RESERVED(12),
certificate_request(13),
server_hello_done_RESERVED(14),
certificate_verify(15),
client_key_exchange_RESERVED(16),
finished(20),
certificate_url_RESERVED(21),
certificate_status_RESERVED(22),
supplemental_data_RESERVED(23),
key_update(24),
message_hash(254),
(255)
} HandshakeType;
```
Were these variants from previous TLS versions? Are they there to prevent
extensions, or future TLS versions, from reusing these code points?
Thanks,
Chris P.
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