I was building up a list of status messages which i was going to have to build with string.concat’s or (more likely) string.format calls, so instead I just added an overload for the case where additional args are passed in. Much nicer 
public static void Add(this List<string> self, string format, params object[] args) { self.Add(String.Format(format, args)); }
[...] that previous post about List<string>.Add? Well, one of the uses of the messages was to get into an [...]
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