Custom data computed per-vertex - Unity Shader Bug fix

On Unity's web site (https://docs.unity3d.com/2017.3/Documentation/Manual/SL-SurfaceShaderExamples.html), Custom data computed per-vertex Shader has a bug, when I try the shader I get correct result in Scene view but not int Game view.

The fix is normalizing the normals.Just add normalize.

void vert (inout appdata_full v, out Input o) {
            UNITY_INITIALIZE_OUTPUT(Input,o);
            o.customColor = normalize(abs(v.normal));
}

Then correct result is: