UnknownSchema: return copy of data

Signed-off-by: Natchar Ratanasirigulchai <natchar.r@outlook.com>

Author: natchar

src/opentimelineio/unknownSchema.h

@@ -39,6 +39,7 @@ class OTIO_API_TYPE UnknownSchema : public SerializableObject
         return _original_schema_version;
     }
 
+    /// @brief Return a copy of the data.
     AnyDictionary data() const noexcept
     {
         return _data;

src/py-opentimelineio/opentimelineio-bindings/otio_serializableObjects.cpp

@@ -302,8 +302,9 @@ define_bases1(py::module m)
         m,
         "UnknownSchema")
         .def_property_readonly("data", [](UnknownSchema* schema) {
-                auto ptr = schema->data().get_or_create_mutation_stamp();
-            return (AnyDictionaryProxy*)(ptr); }, py::return_value_policy::take_ownership)
+                AnyDictionary copy = schema->data();
+                return any_to_py(copy, true /*top_level*/);
+            })
         .def_property_readonly(
             "original_schema_name",
             &UnknownSchema::original_schema_name)

tests/test_unknown_schema.py

@@ -78,7 +78,7 @@ def test_unknown_to_dict(self):
                 "howlongami": otio.opentime.RationalTime(rate=30, value=100)
             }
         )
-        
+
         # Mutation of unkown_data should not mutate the unknown object.
         unknown_data["some_data"] = 0
         self.assertEqual(