As I have always understood it, "spec required" means a
published, stable, readily-accessible, etc., specification.
Not necessarily an RFC but, until the definition of an I-D is
changed to eliminate all of the "don't reference except as 'work
in progress'" and "expires in six months" stuff, it would be
unusual (and objectionable) for posting a spec as an I-D to
qualify.
The TLS expert group, in agreement with the Security AD's, did exactly this.
Start your objections. :)
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