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0.8.3621M downloads/mounicode-org/icu4x ↗New releases in your daily digest, changelog included.

A key-value Map implementation based on a flat, sorted Vec.

Last release 1 months ago
13 Aug 2026
Ships fairly regularly
a new release about every 4 months
Some releases are documented
notes for 7 of 20 stable releases
Nothing withdrawn
no release was ever pulled
6 years old
20 releases · first in 2021

Release timeline

20 releases since 2021

202120222023202420252026

20212026

One column per quarter.

Releases

0.8.313 Aug 2026Breaking
This is technically a breaking change, however if you had code that relied upon this then it was basically guaranteed to be unsound.
Discovered and reported by @Shnatsel

These impls were backwards and unsound.

This is technically a breaking change, however if you had code that
relied upon this then it was basically guaranteed to be unsound.

Changelog: N/A

(This contains its own changelog addition as this is an out of cycle
yoke release)
Open source →
0.8.21 Apr 2026
Nothing published for this version
0.8.128 Oct 2025
Nothing published for this version

From the same repository

unicode-org/icu4x

0.6.026 Sept 20222 sources agree

Non-exhaustive errors for locid, calendar, decimal, plurals (unicode-org#1792, unicode-org#1793)

General data model
- Non-exhaustive errors for locid, calendar, decimal, plurals (unicode-org#1792, unicode-org#1793)
- Rename "serialize" feature to "serde" (unicode-org#1797)
- Turn all errors into Copy types (unicode-org#1657)
- Components
  - calendar:
    - Coptic, Indian and Ethiopian calendars (unicode-org#1660, unicode-org#1715, unicode-org#1779)
    - Calendar arithmetic (unicode-org#1614)
  - datetime:
    - Formatting for fractional seconds (unicode-org#1813, unicode-org#1801)
    - Support for day of week in month ('F') (unicode-org#1770)
    - Custom fallbacking for TimeZoneFormatter (unicode-org#1591)
    - Support for week-of-month (unicode-org#1468)
    - Bug fix to get_best_available_format_pattern skeleton matching logic (unicode-org#1549)
  - decimal: No updates
  - locale_canonicalizer:
    - ZeroCopy support (unicode-org#1760, unicode-org#1777)
  - locid:
    - Simplified language representation (unicode-org#1695)
    - Region, Script and Variant subtags ULE (unicode-org#1696)
  - plurals:
    - Update data model to use ZeroVec (unicode-org#1240)
  - properties:
    - Bidi support (unicode-org#1716, unicode-org#1784)
- Utilities
  - codepointtrie:
    - Use 0 for error value for Rust out-of-bounds for primitive trie value types (unicode-org#1804)
  - crlify: New util for line ending conversions
  - deduplicating_array: No updates
  - fixed_decimal:
    - Improvements to FixedDecimal f64 APIs (unicode-org#1718)
  - litemap:
    - Pluggable LiteMap backends (unicode-org#1769)
  - pattern: No updates
  - uniset: No updates
  - writeable: No updates
  - yoke: No updates
  - zerofrom: No updates
  - zerovec:
    - ZeroVec derive improvements (unicode-org#1780)
    - Support non-Ord values in ZeroMap (unicode-org#1743)
    - Add OptionULE and OptionVarULE (unicode-org#1736)
    - Rename ZeroVec::from_slice and add new method for const-constructed ZeroSlice (unicode-org#1728)
    - Treat ZeroMap sort order as an optional invariant (unicode-org#1727)
    - Add ZeroMap::get_copied_by (unicode-org#1722)
    - Generalize PairULE to support longer tuples (unicode-org#1721)
    - Add more AsULE impls for primitives (unicode-org#1672)
    - Add cast methods to ZeroVec and ZeroSlice (unicode-org#1651)
    - Add RawBytesULE::slice_from_byte_slice (unicode-org#1648)
    - Create façades for ZeroVec types, hide internal code organization modules (unicode-org#1629)
    - Add zerovec::skip_kv and zerovec::skip_ord attributes, as well as generalized attribute handling framework (unicode-org#1613)
    - Rename as_unaligned to to_unaligned (unicode-org#1619)
- FFI:
  - Updating to Diplomat 0.3
  - Making testdata an optional FFI dep (unicode-org#1820)
  - Split out capi targets: make separate freertos, staticlib, and cdylib crates as targets (unicode-org#1747)
- Experimental:
  - crabbake: Initial version of baked data provider (unicode-org#1825)
  - segmenter:
    - Support production-ready data provider for segmenters (unicode-org#1652)
    - Implement dictionary based segmenter for line segmenter. (unicode-org#1644)
    - Wire DataProvider into UAX29 segmenters (unicode-org#1627)
    - Move UAX#14 defines to line.toml (unicode-org#1568)
    - Add segmenter factories to generate UAX29 iterators (unicode-org#1602)

Open source →

0.5.04 Aug 20222 sources agree

DataPayload no longer needs a lifetime (unicode-org#1297, unicode-org#1279)

General data model
- DataPayload no longer needs a lifetime (unicode-org#1297, unicode-org#1279)
- Re-write DataKey (unicode-org#1511)
- Rewrite ErasedDataProvider as AnyProvider (unicode-org#1495)
- Add EitherProvider and rename IterableDataProviderCore to IterableProvider (unicode-org#1455)
- Change DataRequest to be borrowed in BufferProvider (unicode-org#1416)
- Replace SerdeDeDataProvider with BufferProvider (unicode-org#1369, unicode-org#1384)
- Components
  - calendar:
    - Julian, Japanese, and Buddhist calendars (unicode-org#1351, unicode-org#1394, unicode-org#1305)
    - DateTimeFormat integration (unicode-org#1339)
    - Bugfix around arithmetic (unicode-org#1352)
  - datetime:
    - Week-of-year support (unicode-org#1206)
    - DateTimeFormat::resolve_components() (unicode-org#1362)
    - Era formatting (unicode-org#1346)
    - TimeZoneFormatterConfig (unicode-org#1256)
    - New data model for organizing calendar data (unicode-org#1300)
    - Bugfix around missing localized strings in time zone data (unicode-org#1405)
  - decimal: No updates
  - locale_canonicalizer:
    - Bugfix in maximization (unicode-org#1171)
    - Update data model to use LiteMap (unicode-org#1275)
  - locid: No updates
  - plurals:
    - Update data model to use ZeroVec (unicode-org#1240)
  - properties:
    - Rename resource key category for properties (unicode-org#1406)
    - Rename enums for General_Category (unicode-org#1355)
    - Implement the Canonical_Combining_Class property (unicode-org#1347)
    - Implement Script_Extensions property (unicode-org#1353)
    - Add General_Category predicate functions (unicode-org#1310)
    - Implement Grapheme_Cluster_Break, Word_Break, and Sentence_Break Unicode properties (unicode-org#1233)
- Utilities
  - codepointtrie: No changes
  - deduplicating_array: New utility for efficient serialized representation of data with duplicates
  - fixed_decimal:
    - Padding and truncation APIs (unicode-org#1482, unicode-org#1507, unicode-org#1195)
    - Add double-to-decimal via ryū (unicode-org#1217)
    - Handle exponents in FixedDecimal::from_str() (unicode-org#1265)
  - litemap:
    - Add LiteMap::get_indexed() and LiteMap::find_index()
    - Handle serialization of tuples (etc) in litemaps (unicode-org#1306)
  - pattern: No updates
  - uniset: No updates
  - writeable:
    - Adding parts functionality to Writeable (unicode-org#1438)
    - Change Writeable::writeable_to_string to return a Cow (unicode-org#1452)
    - Implementing Writeable for all integers (unicode-org#1408)
    - Making writeable::LengthHint a range (unicode-org#1400)
    - Simplifying assert_writeable_parts_eq and assert_writeable_eq (unicode-org#1522, unicode-org#1399)
  - yoke:
    - Remove Yokeable::Output from ZeroCopyFrom trait (unicode-org#1499)
    - Add EitherCart (unicode-org#1484)
    - Remove attach_to_option_cart() (unicode-org#1348)
    - Homogenize yoke generic impls to always work with Yokeable, add OwnedYokeable (unicode-org#1302)
  - zerovec:
    - Move over to a model where the vector types deref to ZeroSlice and VarZeroSlice (unicode-org#1418, unicode-org#1371)
    - Simplify ZeroVec/VarZeroVec error handling, consolidate ULEError type (unicode-org#1389)
    - Simplify ZeroMapKV (unicode-org#1334)
    - Add ZeroMap2d, a two-dimensional zero-copy map (unicode-org#1432)
    - Add borrowed-only version of ZeroMap (unicode-org#1238)
    - Add various helper functions to zerovec (unicode-org#1430)
    - Rename PlainOldULE to RawBytesULE (unicode-org#1413)
    - Improve EncodeAsVarULE (unicode-org#1385)
    - Add EncodeAsVarULE for ZeroVec (unicode-org#1274, unicode-org#1407)
    - Various trait impls (unicode-org#1332, unicode-org#1330, unicode-org#1328, unicode-org#1287)
    - Document ULE alignment guarantee; update all impls with checklists (unicode-org#1294)
    - Fix PairULE validation function (unicode-org#1266)
- FFI:
  - Updating to the latest Diplomat
  - Add FFI for constructing Data Structs, including decimal data structs (unicode-org#1497)
  - Add padding/truncation to FFI (unicode-org#1501)
  - Add FFI for constructing fixed decimals from float (unicode-org#1483)
  - Properties FFI (unicode-org#1269)
- Experimental:
  - New ListFormatter experiment
  - More progress on segmentation experiment

Open source →

0.4.010 May 20222 sources agree

Updated to CLDR 40 (unicode-org#1216)

Updated to CLDR 40 (unicode-org#1216)
- Functional Unicode property APIs and data; moved to new crate icu_properties (unicode-org#148)
- DateTimeFormat optimization: memory usage cut by two-thirds and perf improved by 40% (unicode-org#519)
- BlobDataProvider allowing for dynamic, asynchronous data loading (unicode-org#1084)
- Major upgrades to the zerovec utility crate and new benchmarks for ZeroMap (unicode-org#1082, unicode-org#1087)
- Initial support for time zones in DateTimeFormat components bag (unicode-org#845)
- Bug fixes in LocaleCanicalizer (unicode-org#1189, etc.)
- Week of month/year arithmetic (unicode-org#918)
- Major improvements on code size across FFI (unicode-org#962)
- Iterations on ICU4X Segmenter (unicode-org#1045, unicode-org#1165, etc.)
- Experimental ListFormatter (unicode-org#1053)
- ICU4X now requires Rust 1.56 (unicode-org#1201)

Open source →

0.3.031 Jan 20222 sources agree

Static data provider without filesystem dependency (unicode-org#78)

Static data provider without filesystem dependency (unicode-org#78)
- Infrastructure around zero-copy deserialization, including ZeroVec and Yoke (unicode-org#652, unicode-org#667)
- Most ICU4X components support no_std (unicode-org#812)
- Hour cycle preferences are used by DateTimeFormat (unicode-org#671)
- Skeleton matching supports additional field widths (unicode-org#584)
- Add canonicalize method to LocaleCanonicalizer (unicode-org#747)
- Added range iterator on UnicodeSet (unicode-org#836)
- Add PluralRules::categories() function (unicode-org#789)
- Consolidated data generation tool into new binary icu4x-datagen

Open source →

0.2.029 Apr 20212 sources agree

Updated CLDR to 39 (unicode-org#640)

Updated CLDR to 39 (unicode-org#640)
- Initial release of:
  - icu_decimal (unicode-org#590)
  - icu_locale_canonicalizer (unicode-org#417)
- DateTimeFormat gets support for
  - day periods (unicode-org#435)
  - time zones (unicode-org#418)
  - components bag (unicode-org#481)
- UnicodeSet gets preliminary support for L3a subset (unicode-org#478)
- PluralRules support E operand (unicode-org#407)
- New utilities:
  - Writeable
  - ZeroVec
  - LiteMap
  - FixedDecimal
  - Pattern
- Early prototype of C API - icu_capi

Open source →

0.1.023 Feb 20212 sources agree

- Initial release of ICU4X. - Initial release of: - icu - icu_locid - icu_plurals - icu_datetime - icu_uniset - icu_provider - icu_provider_fs - icu_p

Initial release of ICU4X.
- Initial release of:
  - icu
  - icu_locid
  - icu_plurals
  - icu_datetime
  - icu_uniset
  - icu_provider
  - icu_provider_fs
  - icu_provider_cldr
  - icu_testdata
  - icu4x_ecma402
  - fixed_decimal

Open source →

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Releases

Changelog: N/A

From the same repository