Changelog

Unreleased

• Added reading compat for stores produced in python with numcodecs.blosc #286

• Bump HTTP compat to 2 #284

• V2 performance improvements #280

  • readblock! fast path for single-chunk full-reads that bypasses the readtask channel and the chunk-shaped scratch buffer, decoding straight into the output array

  • writeblock! fast path for single-chunk full-overwrites that bypasses the readtask/writetask channels and the chunk-shaped scratch buffer, encoding straight from the input array into the store

  • Zero-copy chunk write for NoCompressor + no filters: the single-chunk fastpath hands a reinterpret(UInt8, ain) view straight to the store, skipping the chunk-sized Vector{UInt8} allocation + memcpy

  • NoCompressor writes: replace append! over the reinterpret view with bulk resize! + copyto! in the generic zcompress! fallback

  • NoCompressor reads: bulk-copy zuncompress! method dispatched on ::NoCompressor bypasses copyto!(::Array, ::ReinterpretArray)'s element-by-element walk

  • getchunkarray_undef skips the dead zero-fill of the chunk-shaped scratch buffer on full-overwrite paths

• Added manual pagination in order to go beyond the default 1k #282

• Added wait to writetask in writeblock! #281

• Fix getattrs for v3 #277

• Add CachingStore, a store that caches reads from a remote store in a local cache store #231

• Fix CondaPkg branch in CI, use release version instead #273

• Fix creation of on-disk arrays that do not fit in memory #269

• Add another consistent caching approach through zarrcache #299

v0.10.0 - 2026-04-24

• Enable sharding_indexed codec for Zarr v3 #241

  • outer chunks (shards) are now split into inner chunks with a byte-range index, enabling efficient partial reads of large arrays

  • Python zarr interoperability tests for sharded arrays using real fixtures generated via PythonCall/zarr-python

  • Function-based codec registration system with typed CodecEntry for extensible V3 codec parsing

  • sharding_indexed codec context propagation: inner codec parser now receives element-size context so codecs like blosc get the correct typesize

  • sharding_indexed decode double-shift bug for index_location=:start: shard index offsets are now treated as absolute byte offsets from the shard start in all cases

  • sharding_indexed decode fill value: zdecode! now accepts an optional fill_value argument so missing inner chunks are filled with the array fill value instead of zero(T)

  • pipeline_decode! for V2Pipeline now accepts the fill_value keyword argument (ignored, but required to match the unified call site in ZArray.readblock!)

  • Ragged inner chunks in ShardingCodec handled correctly

• fixes UI str parsing #259

• added zarr_format to ZGroup #258

• Add support for S3Path and remove deprecated global_aws_config() #253

• (docs) get started #246

• update badges #245

• setup vitepress #243

• Registration system for chunk key encoding #242

• test: Consolidate CondaPkg.add calls #240

• test: Read Julia-generated v3 fixtures with Python zarr #239

• Use CondaPkg.jl#206 for nightly, fix manifest_uuid_path #238

• fix docs build #237

• consolidate methods #235

• Add AbstractChunkKeyEncoding #234

• V3 codec pipeline, group creation, and Python interop #232

• Add read support for big endian #230

• Indent method/type signatures on docstrings #229

• Promote header levels in tutorial.md #228

• Continue on v3 PR #226

• move AWSS3 into extension #224