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Add NEWS entry for [[Feature #20429]] #10542

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Add NEWS entry for [[Feature #20429]] #10542

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Expand Up @@ -122,6 +122,11 @@ See GitHub releases like [GitHub Releases of Logger](https://github.com/ruby/log
a warning on verbose mode (`-w`).
[[Feature #15554]]

* Redefining some core methods that are specially optimized by the interpeter
and JIT like `String.freeze` or `Integer#+` now emits a performance class
warning (`-W:performance` or `Warning[:performance] = true`).
[[Feature #20429]]

[Feature #13557]: https://bugs.ruby-lang.org/issues/13557
[Feature #15554]: https://bugs.ruby-lang.org/issues/15554
[Feature #16495]: https://bugs.ruby-lang.org/issues/16495
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