[Numpy-discussion] Problem with absolute value

Hi, I’m a bit surprised with the following code:

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import numpy as np np.seterr(all='warn') Z = np.array([-128], dtype=np.byte) print(np.abs(Z)) [-128]

Obviously, it does not return the absolute value and I get no warning. Is it something expected ? (numpy 1.16.4, python 3.7.3) Nicolas