Use AssertHelper method to get actual type.

src/nunit.analyzers/SameAsOnValueTypes/SameAsOnValueTypesAnalyzer.cs

@@ -71,10 +71,7 @@ protected override void AnalyzeAssertInvocation(SyntaxNodeAnalysisContext contex
             if (actualExpression == null || expectedExpression == null)
                 return;
 
-            var actualTypeInfo = semanticModel.GetTypeInfo(actualExpression, cancellationToken);
-            var actualType = actualTypeInfo.Type ?? actualTypeInfo.ConvertedType;
-
-            actualType = AssertHelper.UnwrapActualType(actualType);
+            var actualType = AssertHelper.GetUnwrappedActualType(actualExpression, semanticModel, cancellationToken);
 
             var expectedType = semanticModel.GetTypeInfo(expectedExpression, cancellationToken).Type;