In the c# SemanticModel is there a way to tell a nullable value type from a reference type?

I am trying to write a custom c# 8 refactoring on classes that are using the new nullable syntax.

I tell the difference between between the "actual" types and the "nullable" types by checking for the "?" at the end of the type name.

The problem is how do I know which variables need a ".Value" to get the value and which variables dont?

For example:

#nullable enable

public class C 
{
   public int actualInt {get; set;}
   public int? nullableInt {get; set;}
   public string actualString {get; set;}
   public string? nullableString {get; set;}
}

Once I have the symantic model, I can get the symbol information like this:

IPropertySymbol symbolInfo = SemanticModel.GetDeclaredSymbol(property) as IPropertySymbol;

But for "actualInt", I see that it is has

symbolInfo.Type.Name == "Int32" (good)

IsReferenceType == true (huh?)

IsValueType == false (huh?)

I would have expected to see IsValueType == true