Issues

• Release 2.4

  unicode-org/icu4x#8604 · Filter by author robertbastian opened on Oct 15, 2026 · 2.4 Release ⟨P1⟩
  

• Source and notice provenance of adapted fxhash_32 (PR #1504)

  unicode-org/icu4x#8603 · Filter by author markus-li opened on Oct 14, 2026
  

• Thai dictionary segmenter breaks inside syllables

  unicode-org/icu4x#8599 · Filter by author kamthorn opened on Oct 13, 2026
  7

  

• Allow preserving unpaired surrogates during normalization

  C-collatorU-chromiumU-ecma402
  unicode-org/icu4x#8594 · Filter by author Manishearth opened on Oct 12, 2026
  1

• FFI for formatToParts

  U-chromium
  unicode-org/icu4x#8590 · Filter by author Manishearth opened on Oct 9, 2026
  10

  

• Thai segmenter breaks before ๆ (MAIYAMOK) and ฯ (PAIYANNOI)

  unicode-org/icu4x#8582 · Filter by author kamthorn opened on Oct 9, 2026

• Policy for LLM usage in communication

  discuss
  unicode-org/icu4x#8578 · Filter by author Manishearth opened on Oct 8, 2026
  1

• North Star: being able to release once a month

  discuss
  unicode-org/icu4x#8577 · Filter by author Manishearth opened on Oct 8, 2026 · Tech Debt Priority ⟨P2⟩
  4

• Style guide and contributor docs: Rust patterns ICU4X uses, what to avoid, and why

  C-metadiscussT-docs-tests
  unicode-org/icu4x#8558 · Filter by author younies opened on Oct 7, 2026
  3

• Documentation by-agents for-agents

  C-metadiscuss
  unicode-org/icu4x#8556 · Filter by author Manishearth opened on Oct 6, 2026
  2

• What are we comfortable fully vibecoding?

  C-metadiscuss
  unicode-org/icu4x#8555 · Filter by author Manishearth opened on Oct 6, 2026
  3

• Datagen round-trip between baked and serde

  C-data-infradiscuss-priorityU-chromium
  unicode-org/icu4x#8550 · Filter by author Manishearth opened on Oct 6, 2026
  10

• [zerovec] Support construction of VarZeroVecOwned from pre-allocated Vec<u8>

  unicode-org/icu4x#8546 · Filter by author Gowee opened on Oct 6, 2026
  1

• DateRangeFormatter prints M12 (release) or panics (debug) when the range pattern uses a different month-name width than the ordinary pattern

  C-datetime
  unicode-org/icu4x#8533 · Filter by author ephoton0210 opened on Oct 1, 2026 · 2.x Priority ⟨P2⟩
  15

• Support CalendarPeriod + Zone in FieldSetBuilder and CompositeFieldSet

  C-datetimeneeds-approvalU-ecma402
  unicode-org/icu4x#8531 · Filter by author sffc-bot opened on Oct 1, 2026
  1

• DateTime and ZonedDateTime try_from_str are hard to use

  C-datetimediscuss
  unicode-org/icu4x#8516 · Filter by author sffc opened on Sep 24, 2026

• Need to migrate GitHub Actions off gsutil

  C-processS-small
  unicode-org/icu4x#8505 · Filter by author sffc opened on Sep 17, 2026 · Tech Debt Priority ⟨P2⟩
  1

• icu_casemap does not expose edit mappings

  unicode-org/icu4x#8467 · Filter by author taj-p opened on Sep 9, 2026
  2

• [Feature] Support write_to_parts and define a currency Part in CurrencyFormatter

  unicode-org/icu4x#8455 · Filter by author younies opened on Sep 3, 2026

• [Question] Should CurrencyFormatter<CompactDecimalFormatter> support per-currency decimal separator overrides?

  C-numbersdiscuss
  unicode-org/icu4x#8454 · Filter by author younies opened on Sep 3, 2026

• Consider exposing TimeZone::Iso and TimeZone::IsoWithZ from field sets

  C-datetime
  unicode-org/icu4x#8440 · Filter by author sffc opened on Aug 31, 2026

• Support the source attribute from Intl.DateTimeFormat.prototype.formatRangeToParts

  C-datetime
  unicode-org/icu4x#8437 · Filter by author jedel1043 opened on Aug 30, 2026 · 2.5 Release ⟨P1⟩
  5

• Allow obtaining a DateTimeFormatter from DateRangeFormatter

  C-datetime
  unicode-org/icu4x#8436 · Filter by author jedel1043 opened on Aug 30, 2026 · 2.5 Release ⟨P1⟩
  12

• Interop between ICU4X Semantic Skeletons, ICU4C, and ECMA DateTimeFormatter

  C-datetimeS-epic
  unicode-org/icu4x#8434 · Filter by author sffc opened on Aug 29, 2026 · 2.5 Release ⟨P1⟩
  8

• zerovec::ule::cast_box callable in an unsound way from the public API

  unicode-org/icu4x#8408 · Filter by author weiznich opened on Aug 20, 2026
  3