v18.1.0
Revert #24236 (Don't recreate the same fallback on the client if hydrating suspends) (#24434)
Land enableClientRenderFallbackOnHydrationMismatch (#24410)
Land enableSelectiveHydration flag (#24406)
Land enableClientRenderFallbackOnTextMismatch flag (#24405)
Add custom element property support behind a flag (#22184)
Remove object-assign polyfill (#23351)