Uhm: There is the OfType method that is generally used to filter an IEnumerable<T?> to IEnumerable<T>. It doesn't care about reference vs value types, because i

Uhm: There is the OfType method that is generally used to filter an IEnumerable<T?> to IEnumerable<T>. It doesn't care about reference vs value types, because it doesn't compare to null. Instead it checks the type of each element. Why? If you have an value, foo, that's declared "int?", (foo is int) evaluates to if there is a value present, and false if there is no value present. The same thing happens if foo is declared as string?. BTW: I checked if the overload can be avoided by using the "default" keyword. It can't.