Proposal and PR Progress Tracking

This page tracks the status of both staged proposals and PRs.

Symbology:

• ✔️ On release track unflagged; note release version
• ✅ Code-complete, but not shipped (behind flag, etc.)
• ⌛ In progress (provide link to the tracking bug)
• ❌ Not started (no tracking bug available)
• ➖ Not applicable

ECMA-402 PRs

Legend:

• TC39: TC39 consensus
• 402: ECMA-402 consensus
• Tests: Test262
• MDN: Documentation on MDN
• SM: SpiderMonkey (Firefox) implementation
• V8: V8 (Chrome) implementation
• JSC: JavaScriptCore implementation

Merged PRs

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC
#175	Normative: Add calendar and numberingSystem options	✔️	✔️	✔️	✔️	✔️ (76)	✔️ (m80)	✔️ (14)
#236	Normative: Support BigInt in NumberFormat and toLocaleString	✔️	✔️	✔️	✔️	✔️ (70)	✔️ (m76)	✔️ (14)
#349	Normative: Allow calendar to determine choice of pattern	✔️	✔️	✔️	➖	✔️	✔️ (m80)	✔️
#351	Normative: Permit relatedYear and yearName in output	✔️	✔️	✔️	✔️	✔️	✔️ (m80)	✔️
#430	Normative: Make @@toStringTag values more meaningful	✔️	✔️	✔️	✔️	✔️ (79)	✔️ (m85)	✔️ (14)
#438	Normative: Update Table 4 Numbering systems	✔️	✔️	✔️	✔️	✔️ (79)	✔️	✔️
#444	Normative: Add length property of RelativeTimeFormat	✔️	✔️	✔️	➖	✔️	✔️	✔️ (14)
#487	Normative: Define @@toStringTag for Intl namespace object	✔️	✔️	✔️	✔️	✔️ (83)	✔️ (m86)	✔️ (14)
#471	Normative: handle awkward rounding behavior	✔️	✔️	✔️	➖	✔️ (85)	✔️ (m88)	✔️
#459	Normative: Allow Collator to get collation from option	✔️	✔️	✔️	✔️	✔️ (85)	✔️ (m86)	✔️

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC
#347	Normative: Add fractionalSecondDigits option	✔️	✔️	✔️	✔️	✔️ (84)	✔️ (m84)	✔️ (14.1)
#346	Normative: Add dayPeriod option	✔️	✔️	✔️	✔️	✔️ (90)	✔️ (m92)	✔️ (14.1)
#500	Normative: Use OrdinaryHasInstance in normative optional steps	✔️	✔️	✔️	➖	✔️ (87)	✔️ (m90)	✔️
#429	Normative: Do not allow duplicate variants within the tlang component of a transformed_extensions	✔️	✔️	✔️	✔️	✔️ (83)	✔️ (m89)	✔️ (14.1)
#573	Normative: Fix TimeZoneName issue in FormatDateTimePattern	✔️	✔️	✔️	➖	✔️	✔️	❌
#577	Normative: Add Lower case mapping definition in 6.1	✔️	✔️	✔️	➖	➖	➖	➖
#571	Normative: Add hourCycle to opt before passing to FormatMatcher	✔️	✔️	✔️	➖	➖	❌	✔️
#572	Normative: Fix spec bugs in numberformat.html caused by Unified NumberFormat	✔️	✔️	❌	➖	✔️	✔️	❌
#614	Normative: Add new numbering system "tnsa"	✔️	✔️	✔️	✔️	✔️ (96)	✔️ (m103)	✔️
#622	Normative: add intl-displaynames-v2			❌	❌	✔️ (91)	✔️(m95)	✔️(15.4)

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC
#647	Normative: Disallow '_' for calendar , referring to UTS35	✔️	✔️	✔️	❌	✔️	✔️	✔️
#701	Normative: Remove order check in PartitionDateTimeRangePattern	✔️	✔️	✔️	➖	✔️ (105)	✔️	✔️
#708	Normative: Add "microsecond" and "nanosecond" to IsSanctionedSingleUnitIdentifier	✔️	✔️	✔️	➖	✔️ (108)	✔️ (m107)	✔️
#714	Normative: Add new numbering systems "kawi" and "nagm"	✔️	✔️	✔️	➖	✔️	✔️ (m110)	✔️
#724	Normative: Canonicalise "GMT" to "UTC"	✔️	✔️	✔️	➖	✔️	✔️	✔️
#729	Normative: Correct Gregorian calendar BC(E) era to signed years less than 1 AD	✔️	✔️	✔️	➖	➖	➖
#768	Normative: Reorder NF resolved option "roundingPriority"	✔️	✔️	✔️	✔️	✔️ (125)	✔️ (m117)	✔️
#786	Normative: raised maximum fractional digits from 20 to 100	✔️	✔️	✔️	✔️	✔️ (121)	✔️ (m117)	✔️
#709	Normative: Read date-time options only once when creating DateTimeFormat objects	✔️	✔️	✔️		✔️ (121)	✔️ (m117)	✔️
#758	Normative: Change the hourCycle default logic	✔️	✔️	✔️	✔️	✔️	✔️ (m124)	✔️

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC
#780	Normative: Added note about sets of locales for web browser implementations needing to not change as a result of user behaviour	✔️	✔️	❌	❌	❌	❌	❌
#788	Normative: Allow UTC offset time zones	✔️	✔️	✔️	✔️	✔️ (121)	✔️ (m120)
#811	Normative: Fix order of rounding* option reads and resolvedOptions()	✔️	✔️	✔️	✔️	✔️ (125)	✔️ (m120)	✔️
#833	Normative: Allow locale based ignorePunctuation default	✔️	✔️	✔️	✔️	✔️ (121)	✔️ (m119)	✔️
#846	Normative: Canonicalize value of extension in ApplyUnicodeExtensionToTag	✔️	✔️	✔️	➖	✔️	✔️	✔️
#877	Normative: specify time zone ID requirements to reduce divergence between engines	✔️	✔️			✔️ (135)
#881	Normative: Canonicalize value of extension in ApplyUnicodeExtensionToTag	✔️	✔️	✔️		✔️	✔️
#918	Normative: Explicitly designate sort order for plural categories returned by Intl.PluralRules.prototype.resolvedOptions	✔️	✔️	✔️		✔️ (135)	✔️ (132)
#919	Normative: Fix bug with RelativeTimeFormat and DateTimeFormat not correctly passing "numberingSystem" option to NumberFormat	✔️	✔️	✔️		✔️	✔️
#922	Normative: Allow use of non-ISO 4217 data in CurrencyDigits AO	✔️	✔️	✔️		✔️	✔️
#925	Normative: When formatting currency values, only use data on the number of minor units used to display that currency when using standard notation.	✔️	✔️	✔️		✔️ (135)	✔️ (132)

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC
#929	Normative: Add 8 new numbering systems for Unicode 16	✔️	✔️	✔️	❌	✔️ (134)	✔️ (m143)	✔️(26.0)
#943	Normative: add Intl.DurationFormat	✔️	✔️	✔️	✔️	✔️ (136)	✔️ (129)	✔️(16.4)
#960	Normative: Add get Locale.prototype.variants	✔️	✔️	✔️	✔️	✔️ (141)	✅	✔️(26.0)
#989	Normative: add notation to PluralRules	✔️	✔️	✔️	❌	✔️ (149)	✔️ (m143)	✔️(26.0)
#1015	Normative: Add missing name property for %IntlSegmentsPrototype%[%Symbol.iterator%]	✔️	✔️	✔️	❌	✔️	✔️	✔️
#1019	Normative: Add CompactDisplay slot to Intl.PluralRules	✔️	✔️	✅	❌	✔️ (149)	✔️ (m143)	❌
#1032	Normative: In PluralRules, set compactDisplay only if notation is "compact"	✔️	✔️	❌	❌	✔️ (149)	✔️ (m143)	❌
#1026	Normative: Make Intl.PluralRules ResolvePlural and associated AOs take Intl mathematical values rather than Numbers	✔️	✔️	❌	❌	❌	❌	❌
#942	Normative: Intl Locale API proposal for Stage 4	❌	❌	❌	❌	❌	❌	❌

Open PRs

PR	Title	TC39	402	Tests	MDN	SM	V8	JSC	Comments
#956	Normative: Update String toLocale{Lower,Upper}Case to ResolveLocale with best-fit matching	❌	❌	❌	❌	❌	❌	❌
#1022	Normative: Increase limits on Intl MV and explicitly limit significant digits	❌	❌	❌	❌	❌	❌	❌

Finished Proposals

• 2020 Edition
• 2021 Edition
• 2022 Edition
• 2023 Edition
• 2025 Edition

Stage 4 (For 2026 Edition)

Proposal	Champion	Tests	MDN	SM	V8	JSC	Polyfills	Comments
Intl Locale Info	Frank Tang	✔️	✔️	✅	✔️(m99)	✔️ (15.4)	✔️

Stage 3

Proposal	Champion	Tests	MDN	SM	V8	JSC	Polyfills	Comments
Time Zone Canonicalization	Justin Grant, Richard Gibson	✔️	❌	❌	❌	❌	❌

Stage 2.7

Note: SM, V8, and JSC are not required for Stage 2.7 proposals; however, they may be written as an early proof-of-concept.

Proposal	Champion	Tests	MDN	SM	V8	JSC	Polyfills	Comments
Intl Era and MonthCode Proposal	Frank Yung-Fong Tang	⌛	❌	❌	❌	❌	❌

Stage 2

Note: Tests, MDN, SM, V8, and JSC are not required for Stage 2 proposals; however, they may be written as an early proof-of-concept.

Proposal	Champion	Stage 2.7 Reviewers	Spec	Tests	MDN	SM	V8	JSC	Comments
eraDisplay option for Intl.DateTimeFormat	Louis-Aime	EAO and DLM	⌛	❌	❌	❌	❌	❌
More Currency Display Choices	Eemeli Aro		⌛	❌	❌	❌	❌	❌

Stage 1

Proposal	Champion	Spec	Comments
Smart Unit Preferences	Younies Mahmoud	❌
Intl.LocaleMatcher	Long Ho	❌
Intl.Segmenter v2	Frank Yung-fong Tang	✔️
Intl.MessageFormat	Eemeli Aro & Ujjwal Sharma	⌛
Intl.MessageFormat.parseResource	Eemeli Aro	❌
Unit Conversion	Younies Mahmoud	❌
Intl.ZonedDateTimeFormat	Frank Yung-Fong Tang	✔️
Amount	Ben Allen	⌛
Keep trailing zeros	Eemeli Aro	⌛