[NSNumber -init] should not destroy itself when called as [super init]. This behaviour was breaking anything that subclassed NSNumber in user code (e.g. PyObjC).

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@33517 72102866-910b-0410-8b05-ffd578937521

Source/NSNumber.m

@@ -763,6 +763,10 @@ if (aValue >= -1 && aValue <= 12)\
  */
 - (id) init
 {
+  if (object_getClass(self) != NSNumberClass)
+    {
+      return [super init];
+    }
   DESTROY(self);
   return nil;
 }