Issues

• Reading 0-d fixed-length bytes arrays (|S<n>) is ~2.5x slower than equally sized uint8 arrays

  zarr-developers/zarr-python#4464 · Filter by author janickm opened on Oct 1, 2026
  2

• Monthly issue metrics report

  zarr-developers/zarr-python#4459 · Filter by author github-actions opened on Oct 1, 2026

• Bugs turned up while creating the zarr-metadata type checker

  zarr-developers/zarr-python#4453 · Filter by author d-v-b opened on Sep 30, 2026

• revisit Spec 0

  zarr-developers/zarr-python#4449 · Filter by author d-v-b opened on Sep 29, 2026
  4

• Release Zarr-Python v3.4.1

  zarr-developers/zarr-python#4448 · Filter by author d-v-b opened on Sep 29, 2026

• [zarr-metadata] runtime type checking

  zarr-developers/zarr-python#4447 · Filter by author d-v-b opened on Sep 29, 2026

• Being able to express multiple range selections on one axis

  zarr-developers/zarr-python#4438 · Filter by author selmanozleyen opened on Sep 27, 2026
  11

• A sharding codec inside another is never validated, and an inner chunk shape that does not divide corrupts data silently

  zarr-developers/zarr-python#4437 · Filter by author d-v-b opened on Sep 27, 2026

• no internal **kwargs

  zarr-developers/zarr-python#4411 · Filter by author d-v-b opened on Sep 25, 2026

• require opt-in to access the pickle codec

  zarr-developers/zarr-python#4404 · Filter by author d-v-b opened on Sep 24, 2026
  1

• A Zarr serialization protocol

  zarr-developers/zarr-python#4399 · Filter by author d-v-b opened on Sep 24, 2026

• improve codec encoded size API

  zarr-developers/zarr-python#4398 · Filter by author d-v-b opened on Sep 24, 2026

• Link Checker Report

  automated issuereport
  zarr-developers/zarr-python#4383 · Filter by author github-actions opened on Sep 21, 2026

• codec validation requires chunk grid info

  zarr-developers/zarr-python#4354 · Filter by author d-v-b opened on Sep 14, 2026

• merge queue

  zarr-developers/zarr-python#4341 · Filter by author d-v-b opened on Sep 12, 2026

• drop our donfig dependency?

  zarr-developers/zarr-python#4320 · Filter by author d-v-b opened on Sep 6, 2026
  1

• how to integrate subpackages

  zarr-developers/zarr-python#4317 · Filter by author d-v-b opened on Sep 4, 2026

• A decoded-chunk cache for v3 reads (revisiting the v2-era #278 / #306)

  zarr-developers/zarr-python#4306 · Filter by author vboussot opened on Sep 2, 2026
  1

• Compiler error in numcodec when installing with GCC 15+

  zarr-developers/zarr-python#4300 · Filter by author romanc opened on Aug 31, 2026

• to_thread is slow

  zarr-developers/zarr-python#4293 · Filter by author d-v-b opened on Aug 26, 2026
  1

• CacheStore never initializes its LRU from an existing cache_store, so a persistent cache directory can grow by a further full max_size for every process that opens it

  zarr-developers/zarr-python#4282 · Filter by author flummoxjr opened on Aug 24, 2026
  3

• Link Checker Report

  automated issuereport
  zarr-developers/zarr-python#4281 · Filter by author github-actions opened on Aug 24, 2026

• subpackage for chunk key encodings

  zarr-developers/zarr-python#4268 · Filter by author d-v-b opened on Aug 16, 2026

• Feature Request: Expose public synchronous encoding/decoding API in Codec / CodecPipeline

  zarr-developers/zarr-python#4243 · Filter by author ElemTran opened on Aug 7, 2026
  4

• (zarr-metadata) builder classes

  zarr-metadata
  zarr-developers/zarr-python#4235 · Filter by author d-v-b opened on Aug 5, 2026
  1