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Add iterators over UTF/Latin1 slices that fuse a CodePointTrie lookup

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-collatorComponent: Collation, normalizationComponent: Collation, normalization

C-segmentationComponent: SegmentationComponent: Segmentation

C-unicodeComponent: Props, sets, triesComponent: Props, sets, tries

Status: Open.

#6925 In unicode-org/icu4x;

· hsivonen opened on Sep 8, 2025

Consider making the segmenter access CodePointTrie in a way that omits the out of range check

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-segmentationComponent: SegmentationComponent: Segmentation

Status: Open.

#6923 In unicode-org/icu4x;

· hsivonen opened on Sep 8, 2025

Add ability for reverse-lookup (string retrieval) in ZeroTrie

C-zerovecComponent: Yoke, ZeroVec, DataBakeComponent: Yoke, ZeroVec, DataBake

Status: Open.

#6922 In unicode-org/icu4x;

· sffc opened on Sep 7, 2025

Make a ZeroTrie dense data optimization

Status: Open.

#6920 In unicode-org/icu4x;

· sffc opened on Sep 5, 2025

Investigate building -u-co-unihan collations without the und-u-co-private-unihan include

A-dataArea: Data coverage or qualityArea: Data coverage or quality

C-collatorComponent: Collation, normalizationComponent: Collation, normalization

Status: Open.

#6918 In unicode-org/icu4x;

· hsivonen opened on Sep 5, 2025

Migrate to CategorizedFormatter and Remove Legacy UnitsFormatter

Status: Open.

#6900 In unicode-org/icu4x;

· younies opened on Aug 26, 2025

Review icu_properties and icu_casemap tries for perf-sensitive lookup by characters in the U+1000 to U+FFFF range

A-dataArea: Data coverage or qualityArea: Data coverage or quality

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-unicodeComponent: Props, sets, triesComponent: Props, sets, tries

Status: Open.

#6885 In unicode-org/icu4x;

· hsivonen opened on Aug 20, 2025

· 

Backlog ⟨P4⟩

Replace normalizer bench data with data from https://github.com/unicode-org/test-corpora/

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-collatorComponent: Collation, normalizationComponent: Collation, normalization

good first issueGood for newcomersGood for newcomers

help wantedIssue needs an assigneeIssue needs an assignee

Status: Open.

#6881 In unicode-org/icu4x;

· hsivonen opened on Aug 19, 2025

· 

Backlog ⟨P4⟩

Update LocaleFallbacker to work better with Copy DataLocale

C-data-infraComponent: provider, datagen, fallback, adaptersComponent: provider, datagen, fallback, adapters

T-techdebtType: ICU4X code health and tech debtType: ICU4X code health and tech debt

Status: Open.

#6878 In unicode-org/icu4x;

· sffc opened on Aug 19, 2025

· 

ICU4X 3.0

Land in-flight normalizer performance improvement in 2.1

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-collatorComponent: Collation, normalizationComponent: Collation, normalization

Status: Open.

#6866 In unicode-org/icu4x;

· hsivonen opened on Aug 15, 2025

· 

2.1 Blocking ⟨P1⟩

LocaleDisplayNamesFormatter should be okay without Variant display names

C-dnamesComponent: Language/Region/... Display NamesComponent: Language/Region/... Display Names

U-ecma402User: ECMA-402 compatibilityUser: ECMA-402 compatibility

U-flutterUser: Flutter Engine or Dart SDKUser: Flutter Engine or Dart SDK

Status: Open.

#6862 In unicode-org/icu4x;

· Manishearth opened on Aug 14, 2025

· 

2.x Priority ⟨P2⟩

Figure out how Hangul NFD to NFC normalization can be made faster

A-performanceArea: Performance (CPU, Memory)Area: Performance (CPU, Memory)

C-collatorComponent: Collation, normalizationComponent: Collation, normalization

Status: Open.

#6860 In unicode-org/icu4x;

· hsivonen opened on Aug 14, 2025

· 

Backlog ⟨P4⟩