C# default(nullable(type)) vs default(type)
In C#, is there a difference between `default(Nullable<long>);` (or `default(long?); `) and `default(long);` ? 

Long is just an example, it may be other types.
C# default(nullable(type)) vs default(type)
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In C#, is there a difference between `default(Nullable<long>);` (or `default(long?); `) and `default(long);` ? 

Long is just an example, it may be other types.