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``subok`` option for `numpy.copy`
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A new kwarg, ``subok``, was added to `numpy.copy` to allow users to toggle the
behavior of `numpy.copy` with respect to array subclasses. The default value
is ``False`` which is consistent with the behavior of `numpy.copy` for
previous numpy versions. To create a copy that preserves an array subclass with
`numpy.copy`, call ``np.copy(arr, subok=True)``. This addition better documents
that the default behavior of `numpy.copy` differs from the
`numpy.ndarray.copy` method which respects array subclasses by default.
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