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lang-cs
IComponentthen the compiler will use the extension every time.myList.First()? or you always cast variables like((IEnumerable<int>)myList).First()before using LINQ methods for example? (Granted for LINQ this is actually feature...)List<int>. When I have anIEnumerable<int>then I call the extension because that's all I have. I don't bother with trying to figure out what implementation I have because the extension handles that better in most cases.