Two comments:
1) I did not like, do not like and will not like any proposal that
has the RFC specify 14 headers to be treated in a special manner,
with no possibility for extension.
2) I lost a lot of enthusiasm for "just use mnemonic" when I discovered
the following "mnemonic encoding": :"< (escape-char doublequote
left pointed bracket).
(for those of yo that did not guess, it is a non-spacing caron
accent - not the commonest of characters, but might easily occur
in stuff converted from ISO 6937 text, where non-spacing accents
are THE way to go....)
No problem in bug-free mailers, but what mailers are bugfree?
Harald Tveit Alvestrand