mrocklin / dask / 3008

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Use automatic chunking in from_zarr

Previously we would use whatever chunking was present in the zarr array.
However storage formats often store smaller chunks than are ideal for
compute frameworks, leading in too many tasks that are too small.

Now we just let da.from_array handle this.  It already has logic to
choose a good chunksize that both respects the alignment within the
zarr array and the chunk size in configuration (usually 128 MiB by
default)

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