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fix: bring back zarr#21

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ilan-gold wants to merge 1 commit intoscverse:mainfrom
ilan-gold:ig/zarr
Open

fix: bring back zarr#21
ilan-gold wants to merge 1 commit intoscverse:mainfrom
ilan-gold:ig/zarr

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@ilan-gold ilan-gold commented Mar 20, 2026

I'm not sure why it was removed but this would be awesome for "data producers"! Starting out with zarr v3 is awesome and really speeds everything up downstream. If I understood why it was removed I would be happy to help out with that going forward - for example maybe making the ndarray dependency in the top level Cargo.toml might help keep everything in line?

https://annbatch.readthedocs.io/en/stable/ makes extensive use of it and we are moving the python package to writing sharded v3 data by default: scverse/anndata#2368 when zarr is requested

cc @rob-p @noamteyssier

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