IDL: Further improve indexed/named property setter type checking

Source/bindings/tests/results/core/V8TestSpecialOperations.cpp

Index: Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
diff --git a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
index 97152c2ef6be50535374d07dd5ca6048e0a9f189..d4f5ebe1b8c39dbb7c17119f5e68c7fa977479bb 100644
--- a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
+++ b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
@@ -88,6 +88,11 @@ static void namedPropertySetter(v8::Local<v8::Name> name, v8::Local<v8::Value> v
     TestSpecialOperations* impl = V8TestSpecialOperations::toImpl(info.Holder());
     TOSTRING_VOID(V8StringResource<>, propertyName, nameString);
     Node* propertyValue = V8Node::toImplWithTypeCheck(info.GetIsolate(), v8Value);
+    if (!propertyValue && !isUndefinedOrNull(v8Value)) {
+        exceptionState.throwTypeError("The provided value is not of type 'Node'.");
+        exceptionState.throwIfNeeded();
+        return;
+    }
     bool result = impl->anonymousNamedSetter(propertyName, propertyValue);
     if (!result)
         return;