Original text:
extension contains a list of MLS ciphersuites that are supported by the client.  7.2. The "expiration" extension represents the time at which clients MUST then it MUST consider the ClientInitKey invalid and not use it for any further processing. <del> Note that as an extension, it is not required that any given ClientInitKey have an expiration time.  In particular, applications that rely on "last resort" ClientInitKeys to ensure continued reachability may choose to omit the expiration extension from these keys, or give them much longer lifetimes than other ClientInitKeys. </del>  7.3.

Reviewer comments:
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Here's the Weekly Digest for : - - Last week 8 issues were created. Of these, 0 issues have been closed and 8 issues are still open. :greenheart: , by :greenheart: , by :greenheart: , by :greenheart: , by :greenheart: , by :greenheart: , by :greenheart: , by :greenheart: , by :speaker: , by It received 1 comments. - - Last week, 6 pull requests were created, updated or merged. Last week, 1 pull request was opened. :greenheart: , by Last week, 3 pull requests were updated. :yellowheart: , by :yellowheart: , by :yellowheart: , by Last week, 2 pull requests were merged. :purpleheart: , by :purpleheart: , by - - Last week there were 10 commits. :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by :hammerandwrench: by - - Last week there were 2 contributors. :bustinsilhouette: :bustin_silhouette: - - Last week there was 1 stargazer. :star: You are the star! :star2: - - Last week there were no releases. - - That's all for last week, please :eyes: Watch and :star: Star the repository to receive next weekly updates. :smiley: You can also .

Revised text:
extension contains a list of MLS ciphersuites that are supported by the client. <ins> These extensions MUST be always present in a ClientInitKey. </ins> 7.2. The "expiration" extension represents the time at which clients MUST then it MUST consider the ClientInitKey invalid and not use it for any further processing.  <ins> Applications that rely on "last resort" ClientInitKeys MAY set the expiration to its maximum value even though this is NOT RECOMMENDED. It is RECOMMENDED to rotate last resort keys at a pace chosen by the application even though they can have much longer lifetimes than other ClientInitKeys. This extension MUST always be present in a ClientInitKey. </ins> 7.3.