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equals-hashcode: equals/hashCode contract demos, missing hashCode and constant-hash costs, mutable keys, records, JPA entity id trap, 13 contract tests

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b66uwsWr9B1ouyrzUh
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Claude
2026-11-12 20:08:35 +05:30
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README.md
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@@ -29,6 +29,7 @@ article; each module's own README has that article's version table, quickstart,
| [`reflection`](reflection/) | Java Reflection and MethodHandles in 2026: How They Work and What They Cost |
| [`jmh-basics`](jmh-basics/) | JMH Tutorial: Writing Java Microbenchmarks That Don't Lie |
| [`string-format`](string-format/) | String.format, formatted() and printf in Java: The Complete Cheat Sheet |
| [`equals-hashcode`](equals-hashcode/) | equals() and hashCode() in Java: The Contract, Real Bugs and How Records Change It |
## License