What's Changed

Dependency updates

• chore(deps): bump the python-dependencies group with 8 updates by @dependabot[bot] in #4488
• chore(deps): bump cairosvg from 2.9.0 to 2.9.1 by @dependabot[bot] in #4499
• chore(deps): bump multidict from 6.7.1 to 6.9.1 by @dependabot[bot] in #4500
• chore(deps): bump multidict from 6.7.1 to 6.9.1 in /packages/zarr-http-server in the uv group across 1 directory by @dependabot[bot] in #4498
• chore(deps): bump werkzeug from 3.1.8 to 3.1.9 by @dependabot[bot] in #4497
• chore(deps): bump github-community-projects/issue-metrics from 5.0.2 to 5.0.3 in the actions group across 1 directory by @dependabot[bot] in #4487
• chore(deps): bump aiohttp from 3.14.3 to 3.14.4 by @dependabot[bot] in #4529
• chore(deps): bump certifi from 2026.4.22 to 2026.10.19 by @dependabot[bot] in #4535
• chore(deps): bump pillow from 12.3.0 to 13.0.0 by @dependabot[bot] in #4540
• chore(deps-dev): bump uv from 0.12.21 to 0.13.4 by @dependabot[bot] in #4536
• chore(deps): bump aiohttp from 3.14.3 to 3.14.4 in /packages/zarr-http-server in the uv group across 1 directory by @dependabot[bot] in #4530
• chore(deps): bump the actions group across 1 directory with 5 updates by @dependabot[bot] in #4552
• chore(deps): bump graphql-core from 3.2.8 to 3.2.12 by @dependabot[bot] in #4567
• chore(deps): bump setuptools from 83.0.0 to 84.1.0 by @dependabot[bot] in #4566

What's Changed

• fix: zero default scalar for bytes fields in structured dtypes by @safaksm in #4495
• test(dtype): cover unicode fields in the structured default scalar test by @d-v-b in #4496
• docs: add a deprecation policy to the contributing guide by @maxrjones in #4051
• fix: bound memory used by resize chunk cleanup by @2160039878-cyber in #4344
• fix: reset the codec-pipeline thread pool after fork by @barlowa124 in #4483
• DOC: fix v3 migration guide store table by @nuglifeleoji in #3850
• docs: save/save_array/save_group write to any store by @maxrjones in #4520
• ci(docs): fix the Read the Docs sub-site builds and skip filters by @d-v-b in #4543
• ci(big-endian): resolve dependencies from pyproject.toml instead of trusting Debian by @d-v-b in #4547
• fix(storage): pickle the zarr.storage module by name by @d-v-b in #4557
• feat(zarr-metadata)!: read metadata against definitions in a scope, and make every model a pair of document and scope by @d-v-b in #4490
• fix(storage): open ZipStore archive on first use from every method and reopen it without truncating by @d-v-b in #4450
• docs: clarify Zarr v3 codec pipeline roles by @mgalore in #4166
• fix(api): apply config when open_array opens an existing array by @d-v-b in #4408
• feat: require opt-in to read data encoded with the pickle codec by @bhaskargurram-ai in #4465
• docs: create the explicit serializer example array with overwrite=True by @d-v-b in #4569
• ci(big-endian): install tzdata so pip check passes on the s390x image by @d-v-b in #4570
• docs: 3.4.2 release notes by @d-v-b in #4565

New Contributors

• @safaksm made their first contribution in #4495
• @2160039878-cyber made their first contribution in #4344
• @barlowa124 made their first contribution in #4483
• @mgalore made their first contribution in #4166
• @bhaskargurram-ai made their first contribution in #4465

Full Changelog: v3.4.1...v3.4.2

What's Changed

Dependency updates

• chore(deps): bump the python-dependencies group with 5 updates by @dependabot[bot] in #4371
• chore(deps): bump the actions group across 1 directory with 4 updates by @dependabot[bot] in #4370
• chore(deps-dev): bump the python-dependencies group with 4 updates by @dependabot[bot] in #4394
• chore(deps): bump codecov/codecov-action from 7.0.0 to 7.1.1 in the actions group by @dependabot[bot] in #4393
• chore(deps): bump astral-sh/setup-uv from 10.1.0 to 10.2.0 in the actions group by @dependabot[bot] in #4460
• chore(deps): bump the python-dependencies group with 7 updates by @dependabot[bot] in #4461
• chore(deps): bump the uv group across 2 directories with 2 updates by @dependabot[bot] in #4463
• chore(deps): bump urllib3 from 2.7.0 to 2.8.0 by @dependabot[bot] in #4462

What's Changed

• ci: keep subpackage pull requests out of generated zarr release notes by @d-v-b in #4361
• fix: replace runtime assert statements with explicit checks by @d-v-b in #4363
• fix(zarr-indexing): replace runtime assert statements with explicit checks by @d-v-b in #4364
• fix(ci): preserve branch zarr in xarray downstream tests by @glaziermag in #4368
• chore: centralize development and CI verbs in just by @d-v-b in #4372
• fix: accept uint8 dtype aliases in Zarr v2 by @guhou-hvi in #4381
• perf: cut the fill_value check on the chunk write path by @PursuitOfDataScience in #4382
• fix(dtype): accept any byte order for byte-order-irrelevant v2 dtype names by @d-v-b in #4385
• fix(ci): run zarr-indexing tests on the matrix interpreter by @d-v-b in #4390
• refactor: keep the blocked all_equal scan on the CPU buffer by @d-v-b in #4392
• chore: bump numcodecs min version by @Oisin-M in #4396
• fix(sharding): reject variable-size codecs in index_codecs by @d-v-b in #4397
• fix(dtype): fix nested v2 round trips and detect unsupported field conversions by @d-v-b in #4340
• fix(dtype): resolve struct fields with the registry that resolves the struct by @d-v-b in #4387
• fix(store): run every LocalStore filesystem call off the event loop by @d-v-b in #4353
• fix(storage): yield only direct children from FsspecStore.list_dir by @d-v-b in #4402
• fix(dtype): preserve scaled generic time units and normalize the μs alias by @d-v-b in #4342
• docs: show package tag instead of monorepo release in subpackage docs by @maxrjones in #4229
• chore: keep sub-package pyproject.toml standalone; overlay in-repo zarr from just by @d-v-b in #4406
• test: deflake test_encode_and_write_as_completed_cancels_stray_writes_on_failure by @d-v-b in #4409
• build: ground sub-package packaging in current uv/hatch/setuptools-scm guidance by @d-v-b in #4407
• fix(array): reject unknown keys in ArrayConfig.from_dict by @d-v-b in #4414
• fix(indexing): avoid full-grid allocations for sparse selections by @d-v-b in #4356
• fix: byte-order bugs and little-endian test assumptions on big-endian hosts by @d-v-b in #4435
• fix: honor storage_options in save and save_group by @Rodrigo-Palma in #4415
• fix: list nested prefixes when FsspecStore path is "" or "/" by @bendichter in #4452
• fix(tests): repair docstring-consistency test and align create_array docs by @guhou-hvi in #4417
• fix(group): apply config when require_array returns an existing array by @d-v-b in #4413
• fix: accept must_understand=false extra fields in v3 group metadata by @anishmehta24 in #4391
• feat(api): declare mode and data on create by @d-v-b in #4455
• fix(group): create group helper arrays in the group's zarr format by @d-v-b in #4412
• fix(api): validate a new node before deleting the existing one by @d-v-b in #4410
• fix(chunk-grids): require chunk sizes of at least 1 and read the 0, false and true sizes older releases stored by @d-v-b in #4334
• test(chunk-grids): sample the full rectilinear chunk grid declaration space by @d-v-b in #4377
• fix(chunk-grids): read mixed regular/rectilinear chunk grids written by zarr 3.2.x by @d-v-b in #4375
• test(stateful): bound how far append grows an axis in the array lifecycle test by @d-v-b in #4470
• fix(sharding): reject a stored shard too short to hold its index on every path by @d-v-b in #4475
• fix(chunk-grids): judge every chunk specification by the chunk normalizer alone by @d-v-b in #4376
• fix: avoid copying 0-d chunk data when indexing CPU NDBuffers by @janickm in #4466
• fix(sharding): validate nested sharding codecs and reject an inner chunk size of 0 by @d-v-b in #4480
• Fix/from array overwrite source by @ianhi in #4405
• fix(ci): run xarray's backend tests from their new package by @d-v-b in #4491
• docs: 3.4.1 release notes by @d-v-b in #4489

New Contributors

• @guhou-hvi made their first contribution in #4381
• @PursuitOfDataScience made their first contribution in #4382
• @Oisin-M made their first contribution in #4396
• @Rodrigo-Palma made their first contribution in #4415
• @bendichter made their first contribution in #4452
• @anishmehta24 made their first contribution in #4391

Full Changelog: v3.4.0...v3.4.1

zarr 3.4.0. Highlights are in the release blog post; the full per-change list is in the release notes. This release adds a required dependency on msgspec>=0.19.

What's Changed

• docs: fix link checker errors and warnings; run weekly by @maxrjones in #4214
• fix: ManagedMemoryStore sync methods must respect the path prefix by @d-v-b in #4204
• fix: minor correctness and hygiene fixes from the sync-pipeline audit by @d-v-b in #4205
• fix: reject malformed chunk keys in DefaultChunkKeyEncoding by @d-v-b in #4219
• fix: explicit store sync-IO capability; wrappers forward it; LatencyStore fixes by @d-v-b in #4206
• docs: add dev blog, update 3.3.0 release notes by @d-v-b in #4191
• fix: make consolidated metadata nesting independent of persisted key order by @d-v-b in #4227
• Convert rst double-backtick docstring markup to markdown by @jhamman in #4193
• fix: preserve non-JSON-serializable storage options in _make_async by @d-v-b in #4239
• chore: bump ruff to 0.16.0 and fix new default-rule violations by @d-v-b in #4213
• docs: add a page linking to the companion packages by @d-v-b in #4247
• docs: update readme by @d-v-b in #4251
• docs: add card for zarr-http-server by @d-v-b in #4249
• fix: allow require_array to accept a ZDType by @JOhnsonKC201 in #4189
• fix: accept numpy integers as chunk sizes by @d-v-b in #4257
• fix(build): use an sdist allowlist so the zarr sdist stops shipping subpackages by @d-v-b in #4261
• Add unified JSON metadata validation via msgspec (#3285) by @vup903 in #4063
• deps: bump cast-value.rs to >= 0.4.2 by @d-v-b in #4260
• docs: add roadmap page outlining future plans by @d-v-b in #4149
• fix: accept universal-pathlib UPath as a StoreLike value by @d-v-b in #4265
• fix: make the nightly hypothesis failure alarm able to file issues by @glaziermag in #4274
• fix: reject a string-valued zero scale in the scale_offset codec by @dylanpulver in #4279
• fix: keep fill value and attributes in from_array by @paraseba in #4288
• fix: skip exact byte comparison for gzip codec due to timestamp variance by @sheikhayaan in #4270
• docs+test: gzip MTIME documentation follow-up and fused-pipeline test style pass - #310 by @d-v-b in #4296
• feat: name packages that provide a codec zarr cannot find by @arcusbuilds in #4277
• Fix infinite loop in _guess_num_chunks_per_axis_shard for 0-dimensional arrays by @Tomatokeftes in #4305
• fix: resolve chunks=-1 to chunk size 1 on zero-length axes by @d-v-b in #4307
• docs: document Read the Docs slugs for subpackage releases by @cucuwang in #4297
• fix: shape the value buffer for coordinate selections in sharded writes by @dylanpulver in #4284
• fix(sharding): flatten any multi-dim value for coordinate selections in partial writes by @d-v-b in #4316
• fix(chunk-grids): make array creation O(1) in per-dimension chunk count by @d-v-b in #4218
• chore(tests): move gzip mtime-comparison helper out of library code by @d-v-b in #4326
• fix: unsigned index arrays raise IndexError because np.diff wraps and uint64 promotes by @selmanozleyen in #4286
• fix: preserve index bounds and input arrays during normalization by @d-v-b in #4332
• docs: state the rectilinear-flag consequence of #4272 and qualify nchunks_initialized by @d-v-b in #4323
• chore(metadata): import Literal at module level in v2.py by @d-v-b in #4327
• fix(metadata): handle argless KeyError from a codec's from_dict by @d-v-b in #4324
• fix: deep-copy source attributes in from_array by @d-v-b in #4325
• fix: resolve chunks=False to chunk size 1 on zero-length axes by @d-v-b in #4328
• feat: accept numpy arrays as chunks/shards in create_array, Group.create_array and from_array by @d-v-b in #4329
• fix: remove attribute nesting depth limit by @d-v-b in #4330
• test: give the sharded coordinate-selection write path real weight in test_oindex by @d-v-b in #4331
• fix: preserve the source Zarr dtype in from_array by @d-v-b in #4335
• docs: explain from_array attribute copy recursion limit by @d-v-b in #4338
• fix(docs): stop the docs build and docs tests deleting a cwd-relative data/ directory by @d-v-b in #4339
• fix: complete imagecodecs codec package hints by @d-v-b in #4351
• fix(store): retry the LocalStore rename when the destination is busy by @Tomatokeftes in #4358
• refactor(store): polish the LocalStore rename retry from #4358 by @d-v-b in #4359
• docs(blog): zarr 3.4.0 release post by @d-v-b in #4355
• docs: 3.4.0 release notes by @d-v-b in #4360

Dependency updates

• chore(deps): bump the python-dependencies group across 1 directory with 11 updates by @dependabot[bot] in #4216
• chore(deps): bump cryptography from 48.0.1 to 50.0.0 by @dependabot[bot] in #4240
• chore(deps): bump aiohttp from 3.14.1 to 3.14.3 by @dependabot[bot] in #4233
• chore(deps): bump pymdown-extensions from 10.21.3 to 11.0 by @dependabot[bot] in #4197
• chore(deps): bump the actions group across 1 directory with 9 updates by @dependabot[bot] in #4241
• chore(deps-dev): bump the python-dependencies group across 1 directory with 5 updates by @dependabot[bot] in #4242
• chore(deps): bump the actions group with 4 updates by @dependabot[bot] in #4258
• chore(deps): bump the python-dependencies group with 6 updates by @dependabot[bot] in #4259
• chore(deps): bump the python-dependencies group across 1 directory with 7 updates by @dependabot[bot] in #4278
• chore(deps): bump the actions group across 1 directory with 4 updates by @dependabot[bot] in #4294
• chore(deps): bump the python-dependencies group with 7 updates by @dependabot[bot] in #4295
• chore(deps): bump CodSpeedHQ/action from 5.0.3 to 5.2.1 in the actions group by @dependabot[bot] in #4308
• chore(deps-dev): bump the python-dependencies group with 5 updates by @dependabot[bot] in #4309
• chore(deps): bump pymdown-extensions from 11.0 to 11.0.1 by @dependabot[bot] in #4314
• chore(deps): bump the python-dependencies group with 6 updates by @dependabot[bot] in #4337
• chore(deps): bump zizmorcore/zizmor-action from 0.6.2 to 0.6.3 in the actions group by @dependabot[bot] in #4336

New Contributors

• @JOhnsonKC201 made their first contribution in #4189
• @vup903 made their first contribution in #4063
• @glaziermag made their first contribution in #427...

What's Changed

• Allow s3 testing in face of ambient AWS credentials by @chuckwondo in #3947
• ci: run all of xarray's tests in downstream workflow by @maxrjones in #3940
• chore(deps): bump the actions group across 1 directory with 12 updates by @dependabot[bot] in #3930
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3943
• chore(zarr-metadata): bump version to 0.1.1 by @d-v-b in #3949
• refactor: simplify internal chunk representation by @d-v-b in #3899
• Fix V3 time types by @chuckwondo in #3955
• chore: fix ability to run mypy via hatch by @chuckwondo in #3952
• Fix minor typos by @kabilar in #3957
• chore(deps): bump the actions group with 5 updates by @dependabot[bot] in #3951
• deprecate blosc enums by @d-v-b in #3963
• BUG: Fix empty Group nodes lacking a "consolidated_metadata" field by @TomAugspurger in #3967
• fix(zarr-metadata): model stored metadata more closely by @d-v-b in #3962
• fix: allow writing to 0-dimensional arrays with sharding by @NIK-TIGER-BILL in #3966
• chore(deps): bump the actions group with 2 updates by @dependabot[bot] in #3970
• chore: run mypy from developer environment by @d-v-b in #3972
• feat:get_ranges by @d-v-b in #3925
• chore: remove warning on fixed length utf32 by @d-v-b in #3979
• misc(zarr-metadata): typed constants and fixes by @d-v-b in #3978
• chore: cd workflow by @d-v-b in #3935
• perf: cache default ArraySpec for regular chunk grids by @d-v-b in #3908
• refactor(sharding): store chunks_per_shard explicitly in _ShardIndex by @d-v-b in #3975
• docs: update link to developer chat by @d-v-b in #3980
• feat(zarr-metadata): partial metadata types by @d-v-b in #3982
• chore(zarr-metadata): set up a changelog by @d-v-b in #3981
• Optimize partial shard reads by @aldenks in #3004
• Do not install CuPy on darwin by @chuckwondo in #3988
• chore(zarr-metadata): prepare for 0.2.0 release by @d-v-b in #3986
• Widen ChunksLike type alias by @chuckwondo in #3990
• fix: match v* when extracting a zarr version from git tags by @d-v-b in #3994
• feat: subchunk write order by @ilan-gold in #3826
• prune old string dtype class by @d-v-b in #3973
• fix: compare metadata objects by JSON form by @d-v-b in #3999
• Run doctests via pytest and fix broken doctests. by @chuckwondo in #4000
• fix(FsspecStore): close owned async filesystem on store.close() by @josh-ag2 in #4003
• chore(deps): bump the actions group across 1 directory with 8 updates by @dependabot[bot] in #4014
• fix: use hatch's default env so the uv installer is inherited by @lhoupert in #4023
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #4024
• docs: test more code snippets in docs by @d-v-b in #4018
• chore(deps-dev): bump uv from 0.11.14 to 0.11.15 in the uv group across 1 directory by @dependabot[bot] in #4019
• refactor: remove random subchunk ordering by @d-v-b in #4011
• fix: make xarray downstream tests work by @d-v-b in #4043
• test: add property tests for block and mask indexing by @maxrjones in #4054
• refactor: use backported sentinel type by @d-v-b in #4046
• chore(deps): bump aiohttp from 3.13.5 to 3.14.0 in the uv group across 1 directory by @dependabot[bot] in #4031
• Revert "fix: make xarray downstream tests work" by @d-v-b in #4047
• chore: indexing test cleanup by @d-v-b in #4001
• refactor/consolidated JSON IO routines by @d-v-b in #3998
• chore(deps): bump the actions group with 3 updates by @dependabot[bot] in #4058
• Modify custom dtype example to use only public API by @chuckwondo in #4052
• fix: copy attributes passed from the user to avoid mutation by @stibrew in #4060
• docs: add core-developer self-merge policy by @maxrjones in #4053
• fix![zarr-metadata]: define JSONValue type, and narrow object annotations to use JSONValue by @d-v-b in #4037
• perf: cache lexicographic chunk coords in sharding codec by @d-v-b in #4012
• deprecate more enums by @d-v-b in #3968
• fix: update OSPO action references to canonical org path by @zkoppert in #3856
• chore(deps): bump tornado from 6.5.5 to 6.5.6 in the uv group across 1 directory by @dependabot[bot] in #4062
• harden developer environment by @d-v-b in #4066
• chore(deps): bump codecov/codecov-action from 6.0.1 to 7.0.0 in the actions group by @dependabot[bot] in #4071
• chore(deps): bump the python-dependencies group with 14 updates by @dependabot[bot] in #4072
• chore(deps): bump tornado from 6.5.6 to 6.5.7 by @dependabot[bot] in #4067
• chore(deps): bump cryptography from 48.0.0 to 48.0.1 by @dependabot[bot] in #4070
• chore(deps): bump aiohttp from 3.14.0 to 3.14.1 by @dependabot[bot] in #4069
• Claude/storage codec bugfixes by @d-v-b in #4074
• chore(deps): bump bleach from 6.3.0 to 6.4.0 by @dependabot[bot] in #4081
• Control sharding codec read coalescing with ArrayConfig and runtime config options by @aldenks in #3987
• chore(deps-dev): bump the python-dependencies group across 1 directory with 2 updates by @dependabot[bot] in #4080
• allow roundtripping the BytesCodec by @keewis in #3417
• feat![zarr-metadata]: extensive top-level exports by @d-v-b in #4083
• zarr metadata 0.3.0 by @d-v-b in #4084
• Claude/py312 modernizations by @d-v-b in #4087
• chore(deps): bump CodSpeedHQ/action from 4.17.0 to 4.17.5 in the actions group by @dependabot[bot] in #4079
• chore: add rectilinear hypothesis block indexing tests by @maxrjones in #4075
• chore(deps): bump pydantic-settings from 2.14.1 to 2.14.2 by @dependabot[bot] in #4089
• chore: dependabot only updates direct dependencies by @d-v-b in #4090
• chore(deps): bump msgpack from 1.1.2 to 1.2.1 by @dependabot[bot] in #4088
• test: pytest cleanups / modernization by @d-v-b in #4093
• fix(testing): correct delete_dir prefix matching in stateful tests by @NIK-TIGER-BILL in #4002
• chore(deps): bump the actions group with 3 updates by @dependabot[bot] in #4097
• Remove struct unstable warning by @d-v-b in https://github.com/zarr-developers/z...

What's Changed

• feat:metadata package by @d-v-b in #3919
• fix: CastValue wrap validation bug by @d-v-b in #3938
• fix: use contextual arrayspec when validating / evolving codecs by @d-v-b in #3941
• fix: defer to fsspec for memory url scheme by @d-v-b in #3944
• release : 3.2.1 release notes by @d-v-b in #3942

Full Changelog: v3.2.0...v3.2.1

What's Changed

• Rename the DimensionNames type to DimensionNamesLike. by @d-v-b in #3800
• docs: remove incorrect redirect by @maxrjones in #3801
• fix: handle special uint32 arrays on Windows correctly by @radoering in #3797
• add release trigger that takes a tag as input by @d-v-b in #3821
• Removes testpypi as a target for the workflow-dispatch-triggered release workflow. by @d-v-b in #3822
• perf: full shard write fast path by @slevang in #3793
• Revert the changes applied in #3821 + #3822 by @d-v-b in #3825
• Fix needs_release_notes.yml workflow by @d-v-b in #3824
• feat: return a useful value from CodecPipeline.read() by @d-v-b in #3828
• docs: fix the docstring for CodecPipeline.write by @d-v-b in #3836
• Improve layout of work in progress page by @dstansby in #3841
• perf: oindex optimization by @slevang in #3830
• chore: spec0 compat (python 3.14 compat, python 3.12 min) by @ilan-gold in #3564
• fix: remove numcodecs off-spec warning by @slevang in #3833
• DOC: remove result="ansi" causing empty code blocks in user guide by @nuglifeleoji in #3845
• chore: use coverage run instead of pytest --cov by @maxrjones in #3847
• DOC: document init_group removal in v3 migration guide by @nuglifeleoji in #3851
• perf/chunktransform by @d-v-b in #3722
• Fill missing chunks by @williamsnell in #3748
• fix: numpy default NaT handling by @ilan-gold in #3863
• DOC: document threading.max_workers config option by @nuglifeleoji in #3852
• chore: add zizmor to repo checks by @d-v-b in #3837
• fix: convert zarr Array to numpy before setitem async dispatch by @nuglifeleoji in #3857
• fix: auto-open ZipStore in list(), list_dir() and exists() by @nuglifeleoji in #3855
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3876
• chore: fix release workflow triggers by @maxrjones in #3794
• Revert "chore: update pre-commit hooks" by @maxrjones in #3877
• chore: fix typos by @DimitriPapadopoulos in #3844
• Update TEAM.md by @maxrjones in #3879
• chore: separate benchmarks into a distinct CI job by @maxrjones in #3873
• feat: add experimental support for rectilinear (variable-sized) chunks by @maxrjones in #3802
• chore: pin mkdocs<2 by @maxrjones in #3881
• chore: add a CI workflow that identifies unlinked types by @maxrjones in #3882
• chore: prefix registry variable names with a single underscore by @d-v-b in #3894
• chore: update failure conditions for docs workflow by @maxrjones in #3887
• fix: simplify and fix codspeed workflow by @d-v-b in #3895
• chore: remove deprecated convenience and creation modules by @d-v-b in #3900
• chore: remove .create methods from arrays by @d-v-b in #3903
• chore: clean up metadata tests by @d-v-b in #3897
• chore: expunge deprecated zarr_version parameter by @d-v-b in #3901
• TESTS: don't force rectilinear config true in the test by @ianhi in #3909
• chore: remove deprecated group methods by @d-v-b in #3902
• feat/memory store registry by @d-v-b in #3679
• Implement support for structured and struct zarr-extension defined dtypes by @BrianMichell in #3781
• fix: make upstream tests pass by @d-v-b in #3920
• docs: add experimental API policy to contributing guide by @nuglifeleoji in #3853
• fix: apply path normalization to fsspec store by @d-v-b in #3924
• Use f-strings by @DimitriPapadopoulos in #3928
• fix(storage): preserve leading slashes in FsspecStore.path by @d-v-b in #3926
• feat: add cast_value and scale_offset codecs by @d-v-b in #3874
• chore: automate more of the release process by @maxrjones in #3896
• chore/3.2.0 release notes by @d-v-b in #3927
• docs: build 3.2.0 release notes by @d-v-b in #3932

New Contributors

• @radoering made their first contribution in #3797
• @slevang made their first contribution in #3793
• @nuglifeleoji made their first contribution in #3845
• @williamsnell made their first contribution in #3748

Full Changelog: v3.1.6...v3.2.0

What's Changed

• Rename the DimensionNames type to DimensionNamesLike. by @d-v-b in #3800
• docs: remove incorrect redirect by @maxrjones in #3801
• fix: handle special uint32 arrays on Windows correctly by @radoering in #3797
• add release trigger that takes a tag as input by @d-v-b in #3821
• Removes testpypi as a target for the workflow-dispatch-triggered release workflow. by @d-v-b in #3822
• perf: full shard write fast path by @slevang in #3793
• Revert the changes applied in #3821 + #3822 by @d-v-b in #3825
• Fix needs_release_notes.yml workflow by @d-v-b in #3824
• feat: return a useful value from CodecPipeline.read() by @d-v-b in #3828
• docs: fix the docstring for CodecPipeline.write by @d-v-b in #3836
• Improve layout of work in progress page by @dstansby in #3841
• perf: oindex optimization by @slevang in #3830
• chore: spec0 compat (python 3.14 compat, python 3.12 min) by @ilan-gold in #3564
• fix: remove numcodecs off-spec warning by @slevang in #3833
• DOC: remove result="ansi" causing empty code blocks in user guide by @nuglifeleoji in #3845
• chore: use coverage run instead of pytest --cov by @maxrjones in #3847
• DOC: document init_group removal in v3 migration guide by @nuglifeleoji in #3851
• perf/chunktransform by @d-v-b in #3722
• Fill missing chunks by @williamsnell in #3748
• fix: numpy default NaT handling by @ilan-gold in #3863
• DOC: document threading.max_workers config option by @nuglifeleoji in #3852
• chore: add zizmor to repo checks by @d-v-b in #3837
• fix: convert zarr Array to numpy before setitem async dispatch by @nuglifeleoji in #3857
• fix: auto-open ZipStore in list(), list_dir() and exists() by @nuglifeleoji in #3855
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3876
• chore: fix release workflow triggers by @maxrjones in #3794
• Revert "chore: update pre-commit hooks" by @maxrjones in #3877
• chore: fix typos by @DimitriPapadopoulos in #3844
• Update TEAM.md by @maxrjones in #3879
• chore: separate benchmarks into a distinct CI job by @maxrjones in #3873
• feat: add experimental support for rectilinear (variable-sized) chunks by @maxrjones in #3802
• chore: pin mkdocs<2 by @maxrjones in #3881
• chore: add a CI workflow that identifies unlinked types by @maxrjones in #3882
• chore: prefix registry variable names with a single underscore by @d-v-b in #3894
• chore: update failure conditions for docs workflow by @maxrjones in #3887
• fix: simplify and fix codspeed workflow by @d-v-b in #3895
• chore: remove deprecated convenience and creation modules by @d-v-b in #3900
• chore: remove .create methods from arrays by @d-v-b in #3903
• chore: clean up metadata tests by @d-v-b in #3897
• chore: expunge deprecated zarr_version parameter by @d-v-b in #3901
• TESTS: don't force rectilinear config true in the test by @ianhi in #3909
• chore: remove deprecated group methods by @d-v-b in #3902
• feat/memory store registry by @d-v-b in #3679
• Implement support for structured and struct zarr-extension defined dtypes by @BrianMichell in #3781
• fix: make upstream tests pass by @d-v-b in #3920
• docs: add experimental API policy to contributing guide by @nuglifeleoji in #3853
• fix: apply path normalization to fsspec store by @d-v-b in #3924
• Use f-strings by @DimitriPapadopoulos in #3928
• fix(storage): preserve leading slashes in FsspecStore.path by @d-v-b in #3926
• feat: add cast_value and scale_offset codecs by @d-v-b in #3874
• chore: automate more of the release process by @maxrjones in #3896
• chore/3.2.0 release notes by @d-v-b in #3927
• docs: build 3.2.0 release notes by @d-v-b in #3932

New Contributors

• @radoering made their first contribution in #3797
• @slevang made their first contribution in #3793
• @nuglifeleoji made their first contribution in #3845
• @williamsnell made their first contribution in #3748

Full Changelog: v3.1.6...v3.2.0rc1

See release notes at https://zarr.readthedocs.io/en/stable/release-notes.html

What's Changed

• Bump the actions group with 2 updates by @dependabot[bot] in #3600
• fix: clearer description of array.target_shard_size_bytes by @ilan-gold in #3599
• chore/pin pytest asyncio by @d-v-b in #3606
• fix tests for stand-alone example scripts by @d-v-b in #3605
• fix: auto-chunking when auto-sharding 1MiB number by @ilan-gold in #3603
• Some minor linter \ type-hint fixes for my own sanity by @xaviernogueira in #3623
• remove pytest pin by @d-v-b in #3619
• use the result of the broadcasted array to check the contents by @hmaarrfk in #3629
• docs: Correct grammar issues in a/an usage by @star1327p in #3634
• Bump the actions group across 1 directory with 5 updates by @dependabot[bot] in #3630
• ci: align pre-commit Python with tooling config by @ramanbansal1 in #3633
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3610
• adjust docstrings for _iter_shard methods / functions by @melonora in #3615
• Add experimental section to the API docs by @maxrjones in #3642
• Add instructions to contributing guide about executable docs by @maxrjones in #3645
• Fix deprecation of setting shape on a numpy array in 2.5+ by @mscheltienne in #3648
• Bump astral-sh/setup-uv from 7.1.6 to 7.2.0 in the actions group by @dependabot[bot] in #3646
• Set copy=False in reshape operation by @mscheltienne in #3649
• Bump mimimum supported version of numpy by @dstansby in #3636
• add benchmarks using pytest-benchmark and codspeed by @d-v-b in #3562
• Simplify testing of different numpy versions by @dstansby in #3654
• Clean up test extra dependencies by @dstansby in #3656
• docs: Correct some typos in documentation by @star1327p in #3661
• Bump actions/checkout from 5 to 6 in the actions group by @dependabot[bot] in #3659
• chore/use prek by @d-v-b in #3658
• Add benchmarks for sharded + local store indexing by @aldenks in #3663
• Add methods for getting bytes + json to store abc by @d-v-b in #3638
• Bump astral-sh/setup-uv from 5 to 7 in the actions group by @dependabot[bot] in #3669
• only run codspeed benchmarks on PRs labelled 'benchmark' by @d-v-b in #3673
• Improve the usability of array runtime config by @d-v-b in #3668
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3689
• Fix HTML syntax errors in README.md table by @DimitriPapadopoulos in #3694
• Fix grammar, typos, and clarity issues in documentation by @DimitriPapadopoulos in #3693
• fix: raise error when encountering nullable string dtype by @flying-sheep in #3695
• lift async array methods to stand-alone functions by @d-v-b in #3676
• don't use depdendabot for the support/v2 branch by @d-v-b in #3701
• Support with read only in wrappers by @BorisTheBrave in #3700
• perf:improve performance of morton order iter by @d-v-b in #3705
• allow numpy ints in shapelike by @d-v-b in #3706
• 🐛 Fix obstore listdir method using _relativize_path by @antoinegaston in #3657
• perf:remove isinstance check by @d-v-b in #3704
• Skip chunk coordinate enumeration in resize when array is only growing (#3650) by @jakenotjay in #3702
• perf:Add additional sharding benchmarks by @mkitti in #3712
• perf: Optimize Morton order with hypercube and vectorization by @mkitti in #3708
• fix/nested shard reads by @d-v-b in #3655
• perf: Vectorize get_chunk_slice for faster sharded writes by @mkitti in #3713
• TEST: fix group selection for delete by @ianhi in #3707
• Add non-power-of-2 shapes for Morton coding to benchmarks by @mkitti in #3717
• perf: Fix near-miss penalty in _morton_order with hybrid ceiling+argsort strategy by @mkitti in #3718
• chore/update hatch + use dependency groups by @d-v-b in #3728
• perf: add sync methods to codecs by @d-v-b in #3721
• fix: implement separate cache for byte-range-requests by @d-v-b in #3710
• chore: update ruff and fix new ruff issues by @DimitriPapadopoulos in #3739
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3738
• Use the prek GitHub Action by @DimitriPapadopoulos in #3745
• Limit privilege escalation and token theft in workflows by @DimitriPapadopoulos in #3742
• chore: no need to check reST files by @DimitriPapadopoulos in #3743
• chore: Pre-commit hook for multi-character lstrip/rstrip by @maxrjones in #3756
• docs: use dark text color on light mode search bar by @maxrjones in #3760
• docs: add example of creating uncompressed arrays (#3464) by @abishop1990 in #3752
• fix: BaseFloat._check_scalar rejects invalid string values (#3586) by @abishop1990 in #3762
• docs: fix docstring for Array.cdata_shape by @maxrjones in #3768
• fix: apply drop_axes squeeze in partial decode path for sharding (#3691) by @abishop1990 in #3763
• docs: add favicon by @maxrjones in #3775
• fix: validate that dask-style chunks have regular shapes by @maxrjones in #3779
• docs: add glossary by @maxrjones in #3767
• docs: fix search color by @maxrjones in #3777
• perf/store sync by @d-v-b in #3725
• Remove rich as required for tree() by @ianhi in #3778
• chore: less frequent codspeed runs by @maxrjones in #3784
• Add missing slash character to towncrier issue format by @d-v-b in #3788
• doc: add ai use policy to contributing guide by @jhamman in #3769
• chore/towncrier header by @d-v-b in #3789
• chore: Use OIDC for publishing by @maxrjones in #3791
• chore/3.1.6 release notes by @d-v-b in #3790

New Contributors

• @xaviernogueira made their first contribution in #3623
• @hmaarrfk made their first contribution in #3629
• @ramanbansal1 made their first contribution in #3633
• @melonora made their first contribution in #3615
• @mscheltienne made their first contribution in #3648
• @flying-sheep made their first contribution in #3695
• @BorisTheBrave made their first contribution in https://github.com/zarr-...

What's Changed

• 3.1.4, not pi by @d-v-b in #3594
• 3.1.5 release notes by @d-v-b in #3598

Full Changelog: v3.1.4...v3.1.5

See release notes at https://zarr.readthedocs.io/en/stable/release-notes.html

What's Changed

• 3.1.3 release notes (#3472) by @d-v-b in #3474
• Add sharding to multiprocessing test by @ziw-liu in #3475
• Use mkdocs-material for Zarr-Python documentation by @maxrjones in #3118
• Changelog entry for docs change by @maxrjones in #3476
• chore: update pre-commit hooks by @DimitriPapadopoulos in #3481
• Customize color theme for docs by @maxrjones in #3477
• Document StoreLike values in user guide by @K-Meech in #3480
• Include shard/chunk shapes in size mismatch error by @dstansby in #3485
• fix pcodec resolution failure by @d-v-b in #3483
• Fix string integer parsing by @ianhi in #3489
• add experimental module by @d-v-b in #3490
• CacheStore containing source store and cache store by @ruaridhg in #3366
• Make ObjectStore a generic class by @dstansby in #3486
• Fix typing in store tests by @dstansby in #3394
• chore/doctests by @d-v-b in #3500
• docs/examples by @d-v-b in #3502
• Imported name is not used anywhere in the module by @DimitriPapadopoulos in #3300
• chore(crc32c): replace crc32c with google-crc32c dependency by @jhamman in #3515
• feature: update default config setting for async.concurrency from 10->64 by @jhamman in #3526
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3509
• Document changes to async.concurrency defaults and performance considerations. by @jhamman in #3528
• Bump the actions group with 2 updates by @dependabot[bot] in #3507
• don't serialize consolidated metadata if it's None by @d-v-b in #3535
• DOC: a array -> an array by @star1327p in #3537
• Fix: allow "bytes" as an alias for "variable_length_bytes" by @d-v-b in #3532
• fix: accept extra fields in array metadata by @d-v-b in #3530
• fsspec path handling by @fjansson in #3343
• Doc update by @christine-e-smit in #3539
• Fix 404 page by @maxrjones in #3543
• fix invalid blosc defaults by @d-v-b in #3545
• Bump the actions group with 3 updates by @dependabot[bot] in #3549
• fix for failing numcodecs.zarr3 codecs by @terraputix in #3326
• fix/simpler blosc tuning by @d-v-b in #3553
• remove dead code by @d-v-b in #3555
• optimize shard writing by @nbren12 in #3561
• chore: make tests faster by @d-v-b in #3533
• chore: update pre-commit hooks by @pre-commit-ci[bot] in #3566
• Improve compatibility between old sphinx and new mkdocs setup by @maxrjones in #3544
• Add an issue template for feature requests by @dstansby in #3572
• DOC: Correct typos in zarr-python documentation by @star1327p in #3579
• Update MemoryStore.get signature to match other stores by @keller-mark in #3581
• concurrency limit 64 -> 10 by @d-v-b in #3578
• feat: bounded size auto sharding via zarr.config by @ilan-gold in #3574
• feat: make async_array public by @ilan-gold in #3556
• Improve store section in migration guide by @dstansby in #3552
• Parametrize Array with v2/v3 metadata by @dstansby in #3304
• Reduce number of documentation redirects needed by @maxrjones in #3584
• update imports in docs by @d-v-b in #3591
• 3.1.4 release notes by @d-v-b in #3540

New Contributors

• @fjansson made their first contribution in #3343
• @terraputix made their first contribution in #3326
• @nbren12 made their first contribution in #3561
• @keller-mark made their first contribution in #3581

Full Changelog: v3.1.3...v3.1.4