Permanently gobbling up the majority of the codespace feels like excessive
force here. For TLS 1.3, the first byte will always be one of alert(21),
handshake(22), or application_data(23), even for custom types. The stated type
for TLSCiphertext has been frozen to application_data(23) with the
This document is relevant to the TLS working because it reserves a large
portion of the TLS content type space. The values 0-19 and 64-255 cannot
be used without checking for conflicts with SRTP-DTLS's wacky
demultiplexing scheme. In TLS 1.3 we will move more encrypted content
types which
