Change:
[[OPEN ISSUE: We have to decide if we want an external coordination via the application of a Handshake proposal.]] <del> 7.8. </del> <ins> 7.9. </ins> As described in message-framing, MLS encrypts three different types of information:

Discussion:
The is no longer needed, since CIKs are referenced by hash. ProposalIDs were no longer usable to refer to proposals since we enabled multiple proposals per MLSPlaintext The syntax description for Welcome was invalid
Merge with master obsoleted some changes. I re-implemented the "supportedversion"->"version" change, and added a "keyid" extension to address Benjamin's comment.
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