- Updated internal Object.assign usage and added a warning that props passed to createElement must be plain objects.
- Fixed several bugs: lifecycle batching duplication, custom elements regression, incorrect onScroll warning in server rendering, IE <object>/<param> handling, and crashes with experimental error boundaries on the server.
- Rewrote React Perf for more accurate data collection and simplified React Native renderer by removing platform‑specific branching, the merge utility, and renaming modules.
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