fix: default version fix.

Author: Ted-Jin-Lab

src/libraries/TedToolkit.RoslynHelper/Names/BaseName.cs

@@ -16,8 +16,7 @@ private protected BaseName(T symbol)
         Symbol = symbol;
         _lazyFullName = new Lazy<string>(() => symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
         _lazyFullNameNull = new Lazy<string>(() => symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat
-            .WithMiscellaneousOptions(SymbolDisplayMiscellaneousOptions.IncludeNullableReferenceTypeModifier |
-                                      SymbolDisplayMiscellaneousOptions.ExpandNullable)));
+            .WithMiscellaneousOptions(SymbolDisplayMiscellaneousOptions.IncludeNullableReferenceTypeModifier)));
         _lazyFullNameNoGlobal = new Lazy<string>(() => symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat
             .WithGlobalNamespaceStyle(SymbolDisplayGlobalNamespaceStyle.Omitted)));
         _lazyMiniName = new Lazy<string>(() => symbol.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat));

src/libraries/TedToolkit.RoslynHelper/Names/ParameterName.cs

@@ -88,9 +88,11 @@ public ParameterSyntax ParameterSyntax
         var type = parameter.Type;
 
         if (value == null)
-            return type.IsReferenceType
-                ? LiteralExpression(SyntaxKind.NullLiteralExpression)
-                : LiteralExpression(SyntaxKind.DefaultLiteralExpression);
+        {
+            return type.IsValueType
+                ? LiteralExpression(SyntaxKind.DefaultLiteralExpression)
+                : LiteralExpression(SyntaxKind.NullLiteralExpression);
+        }
 
         switch (type.SpecialType)
         {