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Extensions such as #1317 are much more useful if there's some guarantee that consumers will honor them.
We could introduce a new attribute of "mustunderstand" that lists the extensions that a consumer must understand in order to process the message further.
I don't know how this would be played out in SDKs, and it could be tricky to add within v1. But let's discuss.
From @jskeet / xregistry/spec#194
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