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Nov 14, 2025
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Prepare for 12.0.0-rc.4 release #8014

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14 changes: 4 additions & 10 deletions CHANGELOG.md
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> - :nail_care: [Polish]
> - :house: [Internal]

# 12.0.0-rc.4 (Unreleased)
# 12.0.0-rc.4

#### :boom: Breaking Change

- Fix some Intl bindings (`Intl.Collator.supportedLocalesOf`, `Intl.DateTimeFormat.supportedLocalesOf`, `Intl.ListFormat.supportedLocalesOf`, `Intl.NumberFormat.supportedLocalesOf`, `Intl.PluralRules.supportedLocalesOf`, `Intl.RelativeTimeFormat.supportedLocalesOf`, `Intl.Segmenter.supportedLocalesOf`) which return `array<string>` and not their corresponding main type `t`. Also remove `Intl.PluralRules.selectBigInt` and `Intl.PluralRules.selectRangeBigInt` which don't work in many JS runtimes. https://github.com/rescript-lang/rescript/pull/7995

#### :eyeglasses: Spec Compliance

#### :rocket: New Feature
- Fix some `Intl` bindings (`Intl.Collator.supportedLocalesOf`, `Intl.DateTimeFormat.supportedLocalesOf`, `Intl.ListFormat.supportedLocalesOf`, `Intl.NumberFormat.supportedLocalesOf`, `Intl.PluralRules.supportedLocalesOf`, `Intl.RelativeTimeFormat.supportedLocalesOf`, `Intl.Segmenter.supportedLocalesOf`) which return `array<string>` and not their corresponding main type `t`. Also remove `Intl.PluralRules.selectBigInt` and `Intl.PluralRules.selectRangeBigInt` which don't work in many JS runtimes. https://github.com/rescript-lang/rescript/pull/7995

#### :bug: Bug fix

- Fix fatal compiler error that occurred when an `%ffi` extension point contained invalid JavaScript https://github.com/rescript-lang/rescript/pull/7998

#### :memo: Documentation
- Fix fatal compiler error that occurred when an `%ffi` extension point contained invalid JavaScript. https://github.com/rescript-lang/rescript/pull/7998

#### :nail_care: Polish

- Dedicated error messages for old Reason array literal syntax (`[|` and `|]`), and for the old pipe (`|>`). Primarly intended to help LLMs that might try to use old code patterns. https://github.com/rescript-lang/rescript/pull/8010

#### :house: Internal

- Rename Core to Stdlib in tests/tests. https://github.com/rescript-lang/rescript/pull/8005
- Rename `Core` to `Stdlib` in tests/tests. https://github.com/rescript-lang/rescript/pull/8005
- CI: Build on `windows-2025` runners. https://github.com/rescript-lang/rescript/pull/8006
- Rewatch: upgrade Rust to 1.91.0. https://github.com/rescript-lang/rescript/pull/8007

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