- Added experimental React.unstable_Profiler component, Pointer Events support in React DOM, and propTypes on context provider components.
- Fixed multiple bugs including proper getDerivedStateFromProps calls, context propagation, forwardRef rendering, custom element attribute handling, test renderer crashes, and shallow renderer ignoring null/undefined state updates.
- Changed internal event names, which may break third‑party packages that depend on React internals.
Community impact
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