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Subarray to object cast now copies
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Casting a dtype that includes a subarray to an object will now ensure
a copy of the subarray. Previously an unsafe view was returned::
arr = np.ones(3, dtype=[("f", "i", 3)])
subarray_fields = arr.astype(object)[0]
subarray = subarray_fields[0] # "f" field
np.may_share_memory(subarray, arr)
Is now always false. While previously it was true for the specific cast.
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