Fix: still allow unboxing.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/interop/PTypeToForeignNode.java

@@ -56,18 +56,18 @@ Object access(Object object) {
 
     public static boolean isBoxed(Object object) {
         if (object instanceof PFloat) {
-            return !((PFloat) object).isNative();
+            return true;
         } else if (object instanceof PInt) {
             try {
                 // try to use primitive
                 PInt boxed = (PInt) object;
                 boxed.longValueExact();
-                return !boxed.isNative();
+                return true;
             } catch (ArithmeticException e) {
                 return false;
             }
         } else if (object instanceof PString) {
-            return !((PString) object).isNative();
+            return true;
         }
         return false;
     }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/interop/PTypeUnboxNode.java

@@ -54,27 +54,27 @@ public static PTypeUnboxNode create() {
 
     public abstract Object execute(Object value);
 
-    @Specialization(guards = "!obj.isNative()")
+    @Specialization
     String access(PString obj) {
         return obj.getValue();
     }
 
-    @Specialization(guards = "!obj.isNative()")
+    @Specialization
     double access(PFloat obj) {
         return obj.getValue();
     }
 
-    @Specialization(guards = "!obj.isNative()", rewriteOn = ArithmeticException.class)
+    @Specialization(rewriteOn = ArithmeticException.class)
     int accessInt(PInt obj) {
         return obj.intValueExact();
     }
 
-    @Specialization(guards = "!obj.isNative()", rewriteOn = ArithmeticException.class)
+    @Specialization(rewriteOn = ArithmeticException.class)
     long accessLong(PInt obj) {
         return obj.longValueExact();
     }
 
-    @Specialization(guards = "!obj.isNative()")
+    @Specialization
     Object accessPInt(PInt obj) {
         try {
             // try to use primitive