It can be more complex than that. When we shipped React-Redux v8, we rewrote our internals to drop our own subscription management logic, and switched to React

It can be more complex than that. When we shipped React-Redux v8, we rewrote our internals to drop our own subscription management logic, and switched to React's new `useSyncExternalStore` hook instead. However, `uSES` only was added with React 18, and we still wanted to support earlier versions of React that had hooks (16.8+, 17). So, we defaulted to using React's "shim" package that provided a backwards-compatible implementation of `usES`, at the cost of a bit of extra bundle size. Once React 18 reached sufficient adoption, we wanted to drop the use of the `uSES` shim package and use the built-in version, but that required React 18 as a minimum dependency. So, we did that in a major, React-Redux v9. Code _using_ React-Redux never changed in the slightest - it's still the same `useSelector` calls either way. But given that anyone attempting to mix React-Redux v9 and React <=17 would have it break, that was clearly a major version bump for us.