Core Changes

• fix: handle file:// URLs from import.meta.resolve in cache handler path (fixes #73796): #90370
• Turbopack: exclude metadata routes from server HMR: #92034
• next.config.js: Accept an option for serverFastRefresh: #91968
• Enable varyParams tracking for Cached Navigations: #92113
• telemetry: set turboFlag correctly: #92149
• Instant Validation: Allow unconfigured slots to render optionally: #92126

Misc Changes

• TURBOPACK: support parse windows absolute path with single slash: #92076
• Turbopack: statically evaluate path.sep: #92150
• docs: add middleware bypass note to CDN caching guide: #92132
• Turbopack: use same hash for immutable-static-hashes.json: #92157
• [turbopack] replace regex with indexof: #92023
• [test] Skip unstable_dynamicStaleTime tests due to flakiness: #92162
• [test] Skip flaky segment-cache-refresh suite: #92163
• Turbopack: createRequire(new URL("...", import.meta.url)): #92153
• Add PPR evals and fix env loading for agent-eval 0.9.5: #92063
• docs: document revalidateTag's required second argument in upgrade guide: #92134
• Turbopack: support targeting even older browsers: #91563

Credits

Huge thanks to @VedantMadane, @wbinnssmith, @fireairforce, @unstubbable, @mischnic, @gnoff, @ijjk, @lukesandberg, @eps1lon, @gaojude, and @aurorascharff for helping!