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Allow specifying default chunks per shard in to_zarr.

The zarr_chunks_per_shard argument in xbeam.Dataset.to_zarr now supports using ... as a key to set a default number of chunks per shard for all dimensions not explicitly listed. Dimensions not included in the mapping default to 1 chunk per shard. This simplifies specifying Zarr chunking strategies.

The `zarr_chunks_per_shard` argument in `xbeam.Dataset.to_zarr` now supports using `...` as a key to set a default number of chunks per shard for all dimensions not explicitly listed. Dimensions not included in the mapping default to 1 chunk per shard. This simplifies specifying Zarr chunking strategies.

PiperOrigin-RevId: 819301545
@copybara-service copybara-service bot merged commit df53dc1 into main Oct 14, 2025
@copybara-service copybara-service bot deleted the test_817766065 branch October 14, 2025 17:51
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