[Experimental] hypothetical selector optimizations?

[markerikson]

Stretch goal, but might want to see if there's any way to leave ways to hook into the subscription process to allow some kind of optimization, such as these ideas:

• [DRAFT] Prototype use of autotracking to optimize subscription behavior reduxjs/react-redux#2047
• [DRAFT] Prototype proxy-based shallow equality selector perf optimization reduxjs/react-redux#2246
• perf(hooks): Optimize useSyncExternalStoreWithSelector selector calls facebook/react#32040