On some protocols, you can tell whether a message was sent to you while you were offline. UIs can't infer this from a difference between message-sent and message-received (maybe the network is slow); let's add a flag representing it to the header.
I think this is fine, although it needs spec cabal approval.
The spec cabal said that this needs a use case, and we don't have one as yet. WONTFIXing.
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