Fix move for numeric dictionary keys (issue stefankoegl#97)

Author: Igor Tkach

jsonpatch.py

@@ -717,7 +717,7 @@ def _item_added(self, path, key, item):
         index = self.take_index(item, _ST_REMOVE)
         if index is not None:
             op = index[2]
-            if type(op.key) == int:
+            if type(op.key) == int and type(key) == int:
                 for v in self.iter_from(index):
                     op.key = v._on_undo_remove(op.path, op.key)
 

tests.py

@@ -419,6 +419,15 @@ def test_nested(self):
         new_from_patch = jsonpatch.apply_patch(old, patch)
         self.assertEqual(new, new_from_patch)
 
+    def test_move_from_numeric_to_alpha_dict_key(self):
+        #https://github.com/stefankoegl/python-json-patch/issues/97
+        src = {'13': 'x'}
+        dst = {'A': 'a', 'b': 'x'}
+        patch = jsonpatch.make_patch(src, dst)
+        res = jsonpatch.apply_patch(src, patch)
+        self.assertEqual(res, dst)
+
+
 
 class OptimizationTests(unittest.TestCase):
     def test_use_replace_instead_of_remove_add(self):