Tuomas Aura: CURRENT TEXT: Section: 5.2.2: "The Signature option MUST
appear as the last option."

PROBLEM: What if we one day want to extend the protocol with a options
that come after the signature?  For example, if we want to have two
different signature options, one has to come before the other.

PROPOSAL: "The receiver MUST ignore any options the come after the
first Signature option."

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Jari Arkko: Ok. I still kept the sender side text as is, I think
that was intended.

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