- Fixed several development‑mode issues: false‑positive IE11 Fragment warning, performance regression, error‑handling bugs, and ensured getDerivedStateFromProps is applied correctly.
- Improved developer warnings for setState in constructors and refined user‑timing API messages for profiling.
- Introduced a new Subscription API, synced package version with React releases, and added a peer dependency requiring React 16.3+.
Community impact
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