Add a new replace(url, init?) alternative to redirect(url, init?) that performs a history.replaceState instead of a history.pushState on client-side navigation redirects (#11811)
Add a new unstable_data() API for usage with Remix Single Fetch (#11836)
- This API is not intended for direct usage in React Router SPA applications
- It is primarily intended for usage with createStaticHandler.query() to allow loaders/actions to return arbitrary data along with custom status/headers without forcing the serialization of data into a Response instance
- This allows for more advanced serialization tactics via unstable_dataStrategy such as serializing via turbo-stream in Remix Single Fetch
- ⚠️ This removes the status field from HandlerResult
  - If you need to return a specific status from unstable_dataStrategy you should instead do so via unstable_data()

Fix internal cleanup of interrupted fetchers to avoid invalid revalidations on navigations (#11839)
Fix initial hydration behavior when using future.v7_partialHydration along with unstable_patchRoutesOnMiss (#11838)
- During initial hydration, router.state.matches will now include any partial matches so that we can render ancestor HydrateFallback components

Full Changelog: v6.25.1...v6.26.0