Enhanced Nullable Types
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Nullable types were enhanced to make them feel more like a full language feature that fits in neatly with the other types, rather than a runtime trick.
For example, variables defined as "nullable Int32" allow full and direct access to all members of Int32 and behave like a true Int32 in every sense - with the addition of allowing nil values.
In combination with the new ":" operator and the newly introduced valueOrDefault helper function, nullable types are now easier to use than ever, and feel much more natural than in any other .NET language.
