This method (as well as several others) would fail in a more extensive test suite; for example, when x = [1,1,2] and y = [2,1,1]; or when x = [-2,-2,-4,-4] and y = [1,3,1,-1]; or when x = [-1,-1,3] and y = [-3,1,1].
@yurenchu, Thanks for pointing this out, I have added a few more test cases now
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