The function xt::argmax(x, 0) returns the wrong index. Ran on Windows 10 with VS2023 v143 compiler. ``` TEST_METHOD(NativeXTensor_ArgMax) { xt::xarray<int> a{ 0, 1, 2, 3, 4, -1}; xt::xarray<int> res = xt::argmax(a, 0); // res[0] is 5 Assert::AreEqual( 4, res[0]); } ``` The expected index is 4 that actual index is 5 that argmax() returns. This seems simlar to xtensor issue #1487