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How does the introduction of nullable versions of value types affect operations that previously required reference types because they might result in null? The as operator comes to mind - from the 2.0 specs: "20.8.6 The as operator The as operator can be used with a type parameter T as the right hand side only if T is known to be a reference type [see §20.7]. This restriction is required because the value null might be returned as a result of the operator. "