Bug with CONCAT

[Michael de Estrada]

I find it interesting that if the first entry is a list, then it works, i.e. CONCAT({5},6) --> {5,6}. However, you can only have one item after the list, e.g. CONCAT({5},6,7) --> [{5} 6 7], but CONCAT({5},{6,7}) --> {5,6,7}. Also, CONCAT(5,{6,7}) --> {5,6,7} works as well.