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chore!: remove zarr.tree and the Array.compressor properties - #4521
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maxrjones merged 4 commits intoNov 9, 2026
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Both were deprecated in 3.0.0 and were scheduled for removal in 3.2.0 by zarr-developers#3325. The rest of that PR shipped in 3.2.0 through zarr-developers#3900-zarr-developers#3903; these did not, and nothing recorded a new date for them. Removed: - zarr.tree, zarr.api.synchronous.tree, zarr.api.asynchronous.tree. Use Group.tree / AsyncGroup.tree. - Array.compressor and AsyncArray.compressor. Use Array.compressors. The warning-only test for zarr.tree is gone, and the v2 compressor assertions in tests/test_v2.py now use `compressors`. The zarr.storage.default_compressor shim from the same zarr-developers#3325 list is left alone; zarr-developers#4505 removes it.
maxrjones
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approved these changes
Nov 8, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #4521 +/- ##
=======================================
Coverage 94.85% 94.85%
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Files 96 96
Lines 14004 13985 -19
=======================================
- Hits 13283 13266 -17
+ Misses 721 719 -2
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Summary
zarr.tree and Array.compressor were deprecated in 3.0.0 and were scheduled for removal in 3.2.0 by #3325. The rest of that #3325 shipped in 3.2.0 through #3900-#3903.
Removed:
The warning-only test for zarr.tree is gone, and the v2 compressor assertions in tests/test_v2.py now use
compressors.The zarr.storage.default_compressor shim from the same #3325 list is left alone, since #4505 removes it.
For reviewers
Would be good to get a +1 on following through with these removals
Author attestation
TODO
docs/user-guide/*.mdchanges/