The tls wg preferred a codepoint outside of the reserved range. This new
codepoint has been assigned by IANA.

See

 - https://datatracker.ietf.org/doc/draft-tls-westerbaan-xyber768d00-02/
 - https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#table-tls-parameters-8