- Breaking API changes: getDefaultProps now shared per class, MyComponent returns a descriptor, prop‑type validation works on descriptors and validators must return Errors.
- New features: rendering to null, normalized keyboard and onBeforeInput events, React.Children.count helper, expanded HTML/SVG attribute support, JSX namespaces, Perf tools, $apply command, and parallel script downloading.
- Bug fixes and improvements: enhanced render batching, proper event view normalization, duplicate‑key warnings instead of hard errors, fixed SVG className updates, unbound img listeners, and updated React Tools documentation with source‑m...
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