Change:
Note that unlike a ParentNode, a ClientInitKey already contains a signature. <del> 7.4. </del> <ins> 7.5. </ins> Each member of the group maintains a GroupContext object that summarizes the state of the group:

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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