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Merge branch 'main' into casting-numcodecs-to-v3
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‎.github/CONTRIBUTING.md‎

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Contributing
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============
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Please see the [project documentation](https://zarr.readthedocs.io/en/stable/contributing.html) for information about contributing to Zarr.
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Please see the [project documentation](https://zarr.readthedocs.io/en/stable/developers/contributing.html) for information about contributing to Zarr.

‎.github/workflows/hypothesis.yaml‎

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strategy:
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matrix:
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python-version: ['3.11']
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python-version: ['3.12']
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numpy-version: ['2.2']
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dependency-set: ["optional"]
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steps:
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- uses: actions/checkout@v4
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- name: Set HYPOTHESIS_PROFILE based on trigger
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run: |
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if [[ "${{ github.event_name }}" == "schedule" || "${{ github.event_name }}" == "workflow_dispatch" ]]; then
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echo "HYPOTHESIS_PROFILE=nightly" >> $GITHUB_ENV
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else
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echo "HYPOTHESIS_PROFILE=ci" >> $GITHUB_ENV
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fi
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- name: Set up Python
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uses: actions/setup-python@v5
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with:
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if: success()
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id: status
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run: |
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echo "Using Hypothesis profile: $HYPOTHESIS_PROFILE"
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hatch env run --env test.py${{ matrix.python-version }}-${{ matrix.numpy-version }}-${{ matrix.dependency-set }} run-hypothesis
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# explicitly save the cache so it gets updated, also do this even if it fails.

‎.github/workflows/test.yml‎

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hatch env create test.py${{ matrix.python-version }}-${{ matrix.numpy-version }}-${{ matrix.dependency-set }}
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hatch env run -e test.py${{ matrix.python-version }}-${{ matrix.numpy-version }}-${{ matrix.dependency-set }} list-env
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- name: Run Tests
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env:
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HYPOTHESIS_PROFILE: ci
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run: |
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hatch env run --env test.py${{ matrix.python-version }}-${{ matrix.numpy-version }}-${{ matrix.dependency-set }} run-coverage
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- name: Upload coverage
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hatch env run -e ${{ matrix.dependency-set }} list-env
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- name: Run Tests
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run: |
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hatch env run --env ${{ matrix.dependency-set }} run
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hatch env run --env ${{ matrix.dependency-set }} run-coverage
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- name: Upload coverage
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uses: codecov/codecov-action@v5
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with:

‎changes/2774.feature.rst‎

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Add `zarr.storage.FsspecStore.from_mapper()` so that `zarr.open()` supports stores of type `fsspec.mapping.FSMap`.

‎changes/2871.feature.rst‎

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Added public API for Buffer ABCs and implementations.
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Use :mod:`zarr.buffer` to access buffer implementations, and
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:mod:`zarr.abc.buffer` for the interface to implement new buffer types.
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Users previously importing buffer from ``zarr.core.buffer`` should update their
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imports to use :mod:`zarr.buffer`. As a reminder, all of ``zarr.core`` is
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considered a private API that's not covered by zarr-python's versioning policy.

‎changes/2874.feature.rst‎

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Adds zarr-specific data type classes. This replaces the internal use of numpy data types for zarr
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v2 and a fixed set of string enums for zarr v3. This change is largely internal, but it does
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change the type of the ``dtype`` and ``data_type`` fields on the ``ArrayV2Metadata`` and
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``ArrayV3Metadata`` classes. It also changes the JSON metadata representation of the
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variable-length string data type, but the old metadata representation can still be
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used when reading arrays. The logic for automatically choosing the chunk encoding for a given data
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type has also changed, and this necessitated changes to the ``config`` API.
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For more on this new feature, see the `documentation </user-guide/data_types.html>`_

‎changes/3130.feature.rst‎

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Port more stateful testing actions from `Icechunk <https://icechunk.io>`_.

‎changes/3138.feature.rst‎

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Adds a `with_read_only` convenience method to the `Store` abstract base class (raises `NotImplementedError`) and implementations to the `MemoryStore`, `ObjectStore`, `LocalStore`, and `FsspecStore` classes.

‎docs/user-guide/arrays.rst‎

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>>> z.info
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Type : Array
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Zarr format : 3
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Data type : DataType.int32
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Data type : Int32(endianness='little')
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Fill value : 0
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Shape : (10000, 10000)
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Chunk shape : (1000, 1000)
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>>> z.info_complete()
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Type : Array
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Zarr format : 3
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Data type : DataType.int32
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Data type : Int32(endianness='little')
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Fill value : 0
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Shape : (10000, 10000)
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Chunk shape : (1000, 1000)
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The default compressor can be changed by setting the value of the using Zarr's
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:ref:`user-guide-config`, e.g.::
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>>> with zarr.config.set({'array.v2_default_compressor.numeric': {'id': 'blosc'}}):
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>>> with zarr.config.set({'array.v2_default_compressor.default': {'id': 'blosc'}}):
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... z = zarr.create_array(store={}, shape=(100000000,), chunks=(1000000,), dtype='int32', zarr_format=2)
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>>> z.filters
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()
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>>> z.info
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Type : Array
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Zarr format : 3
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Data type : DataType.int32
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Data type : Int32(endianness='little')
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Fill value : 0
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Shape : (10000, 10000)
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Chunk shape : (1000, 1000)
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>>> a.info_complete()
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Type : Array
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Zarr format : 3
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Data type : DataType.uint8
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Data type : UInt8()
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Fill value : 0
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Shape : (10000, 10000)
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Shard shape : (1000, 1000)
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Read-only : False
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Store type : LocalStore
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Filters : ()
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Serializer : BytesCodec(endian=<Endian.little: 'little'>)
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Serializer : BytesCodec(endian=None)
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Compressors : (ZstdCodec(level=0, checksum=False),)
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No. bytes : 100000000 (95.4M)
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No. bytes stored : 3981552
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No. bytes stored : 3981473
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Storage ratio : 25.1
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Shards Initialized : 100
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‎docs/user-guide/config.rst‎

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>>> zarr.config.pprint()
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{'array': {'order': 'C',
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'v2_default_compressor': {'bytes': {'checksum': False,
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'id': 'zstd',
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'level': 0},
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'numeric': {'checksum': False,
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'id': 'zstd',
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'level': 0},
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'string': {'checksum': False,
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'v2_default_compressor': {'default': {'checksum': False,
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'id': 'zstd',
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'level': 0}},
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'v2_default_filters': {'bytes': [{'id': 'vlen-bytes'}],
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'numeric': None,
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'raw': None,
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'string': [{'id': 'vlen-utf8'}]},
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'v3_default_compressors': {'bytes': [{'configuration': {'checksum': False,
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'level': 0},
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'name': 'zstd'}],
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'numeric': [{'configuration': {'checksum': False,
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'level': 0},
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'variable-length-string': {'checksum': False,
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'id': 'zstd',
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'level': 0}},
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'v2_default_filters': {'default': None,
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'variable-length-string': [{'id': 'vlen-utf8'}]},
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'v3_default_compressors': {'default': [{'configuration': {'checksum': False,
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'level': 0},
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'name': 'zstd'}],
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'string': [{'configuration': {'checksum': False,
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'level': 0},
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'name': 'zstd'}]},
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'v3_default_filters': {'bytes': [], 'numeric': [], 'string': []},
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'v3_default_serializer': {'bytes': {'name': 'vlen-bytes'},
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'numeric': {'configuration': {'endian': 'little'},
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'name': 'bytes'},
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'string': {'name': 'vlen-utf8'}},
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'write_empty_chunks': False},
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'async': {'concurrency': 10, 'timeout': None},
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'buffer': 'zarr.core.buffer.cpu.Buffer',
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'codec_pipeline': {'batch_size': 1,
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'path': 'zarr.core.codec_pipeline.BatchedCodecPipeline'},
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'codecs': {'blosc': 'zarr.codecs.blosc.BloscCodec',
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'variable-length-string': [{'configuration': {'checksum': False,
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'level': 0},
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'name': 'zstd'}]},
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'v3_default_filters': {'default': [], 'variable-length-string': []},
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'v3_default_serializer': {'default': {'configuration': {'endian': 'little'},
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'name': 'bytes'},
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'variable-length-string': {'name': 'vlen-utf8'}},
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'write_empty_chunks': False},
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'async': {'concurrency': 10, 'timeout': None},
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'buffer': 'zarr.buffer.cpu.Buffer',
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'codec_pipeline': {'batch_size': 1,
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'path': 'zarr.core.codec_pipeline.BatchedCodecPipeline'},
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'codecs': {'blosc': 'zarr.codecs.blosc.BloscCodec',
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'bytes': 'zarr.codecs.bytes.BytesCodec',
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'crc32c': 'zarr.codecs.crc32c_.Crc32cCodec',
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'endian': 'zarr.codecs.bytes.BytesCodec',
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'vlen-bytes': 'zarr.codecs.vlen_utf8.VLenBytesCodec',
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'vlen-utf8': 'zarr.codecs.vlen_utf8.VLenUTF8Codec',
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'zstd': 'zarr.codecs.zstd.ZstdCodec'},
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'default_zarr_format': 3,
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'json_indent': 2,
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'ndbuffer': 'zarr.core.buffer.cpu.NDBuffer',
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'threading': {'max_workers': None}}
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'default_zarr_format': 3,
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'json_indent': 2,
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'ndbuffer': 'zarr.buffer.cpu.NDBuffer',
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'threading': {'max_workers': None}}

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