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OK, so this is a numpy issue. Do you want to raise an issue there or prefer that I do it? I think it is most likely because it is big-endian, though obviously not 100% sure.

I guess this also means we should disable the test on s390x for now, since it will be a while before the corresponding distribution has a fixed numpy.

Thanks. I've submitted numpy/numpy#19153 and mentioned you both on it.

I guess this PR should be made #upstream-fix-required ?

This PR actually can be closed now that the point is proven, but I'll mark #11804 as upstream fix required. Thanks!