numpy.lib.stride_tricks.as_strided() does not preserve some structured dtypes
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Description
In the commit 2293b43ecfadfd4ea2adc9266c8ec18f2ae0ce11 a test for `numpy.lib.stride_tricks.as_strided()` was added in `array.py` checking that it preserves a structured `dtype`. It works for the rather simple type there, but stops working for types with padding set through `offsets` parameter:
import numpy
from numpy.lib.stride_tricks import as_strided
dtype = numpy.dtype({
'names':['i1','nested','i2'],
'formats':['
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