[kabilar]

edit by @yarikoptic: see #1968 (comment) below

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.88%. Comparing base (e4647a6) to head (921558b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1968      +/-   ##
==========================================
+ Coverage   90.82%   90.88%   +0.06%     
==========================================
  Files          92       92              
  Lines       14190    14190              
==========================================
+ Hits        12888    12897       +9     
+ Misses       1302     1293       -9     

Flag	Coverage Δ
unittests	90.88% <ø> (+0.06%)	⬆️

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[yarikoptic]

to act in clear consciousness requires review of why we had that ceiling to start with and add that to PR description. I recall that there were dances in similar "let's just change it" cases which had ramifications. May be the comment above should reflect that ceiling!

[CodyCBakerPhD]

As I recall the more meaningful piece was always numcodecs (which caused more of the issues historically), not the zarr upper bound itself

Should we just relax to accept w/e loose upper bound?

🤖 AI below 🤖

The risk is low and the green CI is meaningful.

Where the ceiling came from

There was never a known zarr breakage behind the ceiling.

Each time, it was set to whatever zarr release was newest when the PR was opened:

When	PR	Change	Why
2025-06-17	#1653 (kabilar)	zarr ~= 2.10 → >= 2.10, <= 3.0.8	Unblock zarr v3 for another project. 3.0.8 was the latest release. The only discussion was about adding numcodecs < 0.16 (since removed).
2026-01-29	#1779 (kabilar)	<= 3.0.8 → <= 3.1.5	3.1.5 was the latest. yarikoptic flagged zarr 3.1.x breaking changes and floated excluding 3.1.1, but merged since the CI failures were unrelated.
2026-08-04	96be4a8 (yarikoptic)	floor 2.10 → 2.18.0	Floor only; the ceiling stayed. The comment above the pin explains the floor, but nothing explains the ceiling.
2026-10-27	#1968	<= 3.1.5 → <= 3.4.2	3.4.2 is the latest release (published the same day).

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🤖 Generated with Claude Code

https://claude.ai/code/session_01DQrzw3wdzKwrz1CxTooZum

[yarikoptic]

If no side effects from my pushed ceiling - can be merged