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You: In 20 minutes, check the garage sensor
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I want to pause on that for a moment, because it’s important. Composition lets us combine primitive CRDTs into more complex ones. When it’s time to merge, all the parent does is pass slices of incoming state to the appropriate child’s merge function. We can nest this process as many times as we want; each complex CRDT passing ever-smaller slices of state down to the next level, until we finally hit a primitive CRDT that performs the actual merge.
Swartz in 2011, two years before his death (source)