Issues

• meson build: SSE2/AVX2 Blosc shuffle is never enabled with MSVC (Windows branch is dead code)

  zarr-developers/numcodecs#866 · Filter by author d-v-b opened on Sep 29, 2026
  2

• FixedScaleOffset flattens arrays, breaking further image codecs

  zarr-developers/numcodecs#852 · Filter by author raphaeljolivet opened on Aug 3, 2026
  3

• vlen and filter codecs encode F-contiguous arrays in memory order, not logical order

  zarr-developers/numcodecs#850 · Filter by author oldrobotdev opened on Jul 2, 2026

• Restore zarr-python v2 compatibility in 0.16.x by re-exporting cbuffer_sizes / cbuffer_metainfo

  zarr-developers/numcodecs#849 · Filter by author mkitti opened on Jun 20, 2026

• Release 0.15.2?

  zarr-developers/numcodecs#847 · Filter by author mkitti opened on Jun 20, 2026
  1

• Can't roundtrip compression/decompression with empty numpy array

  zarr-developers/numcodecs#831 · Filter by author pfackeldey opened on Mar 20, 2026

• numcodecs.LZ4 not compatible with lz4.fram and cramjam.lz4

  zarr-developers/numcodecs#816 · Filter by author Rachit931 opened on Feb 11, 2026
  2

• RFC: Lossless fixed-width integer bit-packing codec for ADC-style data

  zarr-developers/numcodecs#813 · Filter by author sakshi2433 opened on Dec 25, 2025
  4

• ZFP with Zarr breaks when data is a view

  zarr-developers/numcodecs#812 · Filter by author tasansal opened on Dec 17, 2025

• RuntimeError: error during blosc decompression: -1

  zarr-developers/numcodecs#810 · Filter by author alxmrs opened on Nov 24, 2025
  5

• BitRound codec returns NaN if keepbits has dtype int32 instead of int64

  zarr-developers/numcodecs#793 · Filter by author huard opened on Oct 10, 2025

• Consider supporting SZ

  zarr-developers/numcodecs#770 · Filter by author ashiklom opened on Jul 24, 2025

• monorepo

  zarr-developers/numcodecs#769 · Filter by author d-v-b opened on Jul 21, 2025

• Delta nan handling

  zarr-developers/numcodecs#765 · Filter by author slowjazz opened on Jul 14, 2025

• C compilation warnings, signedness comparison, uninitialized

  zarr-developers/numcodecs#758 · Filter by author mkitti opened on Jun 28, 2025

• ensure_contiguous_memoryview has trouble with numpy M data type in a structured array.

  zarr-developers/numcodecs#755 · Filter by author d-v-b opened on Jun 26, 2025

• ENH: Free-Threading (No-GIL) Support for Python 3.13+

  zarr-developers/numcodecs#749 · Filter by author HaoZeke opened on May 26, 2025
  7

• relationship with zarr

  zarr-developers/numcodecs#742 · Filter by author d-v-b opened on Apr 22, 2025
  4

• Convert warnings on CI to errors

  zarr-developers/numcodecs#727 · Filter by author jakirkham opened on Apr 7, 2025

• Warning: Package 'numcodecs.tests.package_with_entrypoint' is absent from the packages configuration

  zarr-developers/numcodecs#726 · Filter by author jakirkham opened on Apr 7, 2025

• cannot import name 'cbuffer_sizes' from 'numcodecs.blosc'

  zarr-developers/numcodecs#721 · Filter by author aamster opened on Apr 7, 2025
  5

• deprecate pickle codec

  zarr-developers/numcodecs#706 · Filter by author d-v-b opened on Feb 12, 2025

• Integrate Zarr v3 compatibility module with registry.

  zarr-developers/numcodecs#699 · Filter by author sharkinsspatial opened on Feb 6, 2025
  1

• Support for the free-threaded build of CPython 3.13

  zarr-developers/numcodecs#670 · Filter by author tomwhite opened on Dec 13, 2024
  2

• Codec for LogScale

  New codec
  zarr-developers/numcodecs#661 · Filter by author gauteh opened on Nov 28, 2024
  4