On Tue, Sep 13, 2016 at 10:54:19AM -0400, John C Klensin wrote: > Yes, but, again, I think it is more than hints -- I think there > either needs to be enough information in the spec for safe, > interoperable, independent implementations to be created or that > it isn't appropriate for a Proposed Standard. I agree that the specification needs to provide sufficient guidance so that implementors don't make various otherwise likely mistakes. -- Viktor.