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`numpy.genfromtxt` now correctly unpacks structured arrays
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Previously, `numpy.genfromtxt` failed to unpack if it was called with
``unpack=True`` and a structured datatype was passed to the ``dtype`` argument
(or ``dtype=None`` was passed and a structured datatype was inferred).
For example::
>>> data = StringIO("21 58.0\n35 72.0")
>>> np.genfromtxt(data, dtype=None, unpack=True)
array([(21, 58.), (35, 72.)], dtype=[('f0', '<i8'), ('f1', '<f8')])
Structured arrays will now correctly unpack into a list of arrays,
one for each column::
>>> np.genfromtxt(data, dtype=None, unpack=True)
[array([21, 35]), array([58., 72.])]
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