The issue with that layout (and with my examples) is that the first element is the odd one, and you can't reorder it. I think it's better this way (usually the

The issue with that layout (and with my examples) is that the first element is the odd one, and you can't reorder it. I think it's better this way (usually the first different is special, and also you usually add things at the end) but I prefer a trailing comma over the comma at the left. A leading comma, like the article discuss, would be an nice addition indeed