Hi, David. One note on your review:
idnits didn't like the reference to RFC 20 for ASCII:
** Downref: Normative reference to an Unknown state RFC: RFC 20
RFC 5234 (ABNF) uses this, which looks like a better reference:
[US-ASCII] American National Standards Institute, "Coded Character
Set -- 7-bit American Standard Code for Information
Interchange", ANSI X3.4, 1986.
Except that (1) many IETF documents do use RFC 20 and (2) the RFC 20
reference is not for ASCII: it's for RS, the Record Separator
character, which is explained in RFC 20, Section 5.2.
Barry