Requist for method `ndarray.abs()`

There needs to have a method `ndarray.abs()`. For example, let `x = numpy.array([-1, 0, 2])`, very often I need to compute elementwise absolute value like `x.abs()` whose expected result is `numpy.array([1, 0, 2])`. But until now I need to write `numpy.abs(x)`, which is not so convenient. I believe many people want this feature. Actually, I wait this method for more than ten years, but it still has not appear yet. So I decide to report this requist.
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