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  schiller-manuel-link-nested-value-stability
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fix(react-router): treat Link params and search as immutable inputs `useValueStable` kept a shallow copy of `params` / `search` / `activeOptions` (dac2bf249f) so that an object mutated in place would yield a new reference on the next render. That only ever held one level deep: a nested change such as `search.filters.page = 2` left the shared nested reference in the copy, `deepEqual` short-circuited on it, `dest` kept its identity and `buildLocation` served the cached location. Detecting mutation is not a contract React lets us keep. A mutation on its own never renders anything; the tests that exercised it needed a manual re-render button to observe the change, which is the same situation as a mutated `React.memo` prop or `useMemo` dependency. Rather than snapshot deeper (measured +63 gzip bytes on react-router.minimal and a 3-5x slower compare whenever nested references are shared, since nothing can short-circuit), `useValueStable` stores the caller's reference again, as on main. The reference is the router's invalidation signal: pass a new object to change a destination. The regression test now pins the contract that can actually break: fresh inline literals with equal nested contents must not trigger another `buildLocation`, and a nested value that changes through React state must produce a new href on that render and keep it across navigations. The accessor and in-place mutation tests are removed along with the promise in the changeset. Bundle (react-router.minimal gzip): 86038 -> 86026 (-12). Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

nx affected --targets=test:eslint,test:unit,test:e2e,test:types,test:build,build --parallel=3

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routerWorkspace