John,
I suggest that it is not so much a conflict with the ongoing
work of an IETF WG, but a flat technical error. 
And I would in general agree with you, but in this case the stuff was 
already deployed very widely, and the purpose of the publication was to 
document existing practice. I agreed that the draft had to be published 
as it was. Of course, a clean design would have been different, but what 
do you do?
Jari
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