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``==`` and ``!=`` warnings finalized
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The ``==`` and ``!=`` operators on arrays now always:
* raise errors that occur during comparisons such as when the arrays
have incompatible shapes (``np.array([1, 2]) == np.array([1, 2, 3])``).
* return an array of all ``True`` or all ``False`` when values are
fundamentally not comparable (e.g. have different dtypes). An example
is ``np.array(["a"]) == np.array([1])``.
This mimics the Python behavior of returning ``False`` and ``True``
when comparing incompatible types like ``"a" == 1`` and ``"a" != 1``.
For a long time these gave ``DeprecationWarning`` or ``FutureWarning``.
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