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[v3] Structured dtype support #2134

@jhamman

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@jhamman

Zarr-Python 2 supported structured dtypes. I don't think this has been discussed much, if at all, in the context of version 3.

This once worked:

a = np.array(
    [(b"aaa", 1, 4.2), (b"bbb", 2, 8.4), (b"ccc", 3, 12.6)],
    dtype=[("foo", "S3"), ("bar", "i4"), ("baz", "f8")],
)
za = zarr.array(a, chunks=2, fill_value=None)
za[:]

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