According to the documentation of the as operator, as "is used to perform certain types of conversions between compatible reference types". Since Nullable is actually a value type, I would expect as not to work with it. However, this code compiles and runs:

object o = 7;
int i = o as int? ?? -1;
Console.WriteLine(i); // output: 7

Is this correct behavior? Is the documentation for as wrong? Am I missing something?

c# nullable autoboxing
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