finally narrowed it down.
You used to be able to do this from UnityScript/JS files and access some Boo object, but you can't anymore, hence the message:
var row:Boo.Lang.Hash = eval("{" + ary[i] + "}");
A simple fix would be to use a Hashtable:
var row:Hashtable = new Hashtable();
row.Add(ary[i].ToString(), ary[i] as Object);
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