3.4.2

Issues

• fix(storage): open ZipStore archive on first use from every method and reopen it without truncating

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  zarr-developers/zarr-python#4450·d-v-b opened Sep 29, 2026 · Updated Oct 8, 2026
  1

• fix(api): apply config when open_array opens an existing array

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  zarr-developers/zarr-python#4408·d-v-b opened Sep 25, 2026 · Updated Oct 8, 2026·Draft
  1

• fix: ensure ZipStore is open before acquiring lock

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  zarr-developers/zarr-python#3593·oelhammouchi opened Nov 21, 2025 · Updated Oct 8, 2026
  8

• docs: define the public API in the contributing guide

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  zarr-developers/zarr-python#4501·d-v-b opened Oct 9, 2026 · Updated Oct 9, 2026·Draft

• docs: clarify Zarr v3 codec pipeline roles

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  zarr-developers/zarr-python#4166·mgalore opened Jul 20, 2026 · Updated Oct 9, 2026
  4

• fix(array): keep other fields intact when writing one field of a structured array

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  zarr-developers/zarr-python#4503·d-v-b opened Oct 9, 2026 · Updated Oct 11, 2026·Draft
  1

• fix(metadata): read Zarr V3.1 short-hand extension names

  spec compliance
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  zarr-developers/zarr-python#4506·d-v-b opened Oct 10, 2026 · Updated Oct 10, 2026
  1