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Add breaking change notice for #44660
Bug: https://github.com/dart-lang/sdk/issues/44660 Change-Id: Ie0760c933a8adbc8b5964e38681c3f9e9dfef114 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/179584 Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Kevin Moore <kevmoo@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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CHANGELOG.md
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CHANGELOG.md
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### Language
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**Breaking Change** [Null
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Safety](https://dart.dev/null-safety/understanding-null-safety) is now enabled
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by default in all packages with a lower sdk constraint of 2.12.0 or greater.
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Files that are not subject to language versioning (whether because they are not
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contained in a pub package, or because the package that they are contained in
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has no lower sdk constraint) are treated as opted into to null safety by default
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and may report new errors. Pub packages may be opted out of null safety by
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setting a min sdk constraint in pubspec.yaml of 2.9.0 or less. Files may be
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opted out of null safety by adding `// @dart=2.9` to the beginning of the file.
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* **Breaking Change** [Null
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Safety](https://dart.dev/null-safety/understanding-null-safety) is now
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enabled by default in all packages with a lower sdk constraint of 2.12.0 or
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greater. Files that are not subject to language versioning (whether because
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they are not contained in a pub package, or because the package that they
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are contained in has no lower sdk constraint) are treated as opted into to
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null safety by default and may report new errors. Pub packages may be opted
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out of null safety by setting a min sdk constraint in pubspec.yaml of 2.9.0
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or less. Files may be opted out of null safety by adding `// @dart=2.9` to
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the beginning of the file.
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* **Breaking Change** [#44660][]: Fixed an implementation bug where `this`
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would sometimes undergo type promotion in extensions.
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[#44660]: https://github.com/dart-lang/sdk/issues/44660
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### Core libraries
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