Support foreign strings in PyUnicodeCheckNode

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/lib/PyUnicodeCheckNode.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2022, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -41,7 +41,6 @@
 package com.oracle.graal.python.lib;
 
 import com.oracle.graal.python.builtins.PythonBuiltinClassType;
-import com.oracle.graal.python.builtins.objects.cext.PythonAbstractNativeObject;
 import com.oracle.graal.python.builtins.objects.str.PString;
 import com.oracle.graal.python.nodes.PNodeWithContext;
 import com.oracle.graal.python.nodes.classes.IsSubtypeNode;
@@ -79,16 +78,11 @@ static boolean doPString(@SuppressWarnings("unused") PString object) {
         return true;
     }
 
-    @Specialization
-    static boolean doNative(Node inliningTarget, PythonAbstractNativeObject object,
+    @Fallback
+    static boolean doOther(Node inliningTarget, Object object,
                     @Cached GetClassNode getClass,
                     @Cached(inline = false) IsSubtypeNode isSubtype) {
         Object type = getClass.execute(inliningTarget, object);
         return isSubtype.execute(type, PythonBuiltinClassType.PString);
     }
-
-    @Fallback
-    static boolean doOther(@SuppressWarnings("unused") Object object) {
-        return false;
-    }
 }