I would say it is most definitely not the concern of Observe to watch reads and between accessors and Proxies we have all the tools we need for that. With the ability to keep present on notifications of changes via observe it's actually possible to implement a mirror that can be emit change events (by explicitly mirroring changes on the original target changes) and provide the benefits of the observe api to listeners, and then implement any kind of additional tracking on top of that either by using accessors or being a proxy.
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