Keep subscription surface module-owned

Author: trissim

src/objectstate/__init__.py

@@ -222,10 +222,7 @@
 
 
 # Object state management
-from objectstate.object_state_registry import (
-    ObjectStateRegistry,
-    ObjectStateRegistrySubscription,
-)
+from objectstate.object_state_registry import ObjectStateRegistry
 from objectstate.object_state import ObjectState
 from objectstate.object_state_metadata import (
     ObjectStateMetadataContract,
@@ -262,7 +259,6 @@
     # Object state
     'ObjectState',
     'ObjectStateRegistry',
-    'ObjectStateRegistrySubscription',
     'ObjectStateMetadataContract',
     'ObjectStateMetadataContractRegistry',
     'ObjectStateMetadataStore',

src/objectstate/object_state_registry.py

@@ -227,7 +227,7 @@ def remove_history_changed_callback(cls, callback: Callable[[], None]) -> bool:
     @classmethod
     def _subscribe_callback(
         cls,
-        callbacks: List[RegistryCallback],
+        callbacks: list[RegistryCallback],
         callback: RegistryCallback,
     ) -> ObjectStateRegistrySubscription:
         if callback in callbacks:
@@ -239,7 +239,7 @@ def _subscribe_callback(
 
     @staticmethod
     def _remove_callback(
-        callbacks: List[RegistryCallback],
+        callbacks: list[RegistryCallback],
         callback: RegistryCallback,
     ) -> bool:
         if callback not in callbacks:

tests/test_registry_subscription.py

@@ -2,7 +2,8 @@
 
 import pytest
 
-from objectstate import ObjectStateRegistry, ObjectStateRegistrySubscription
+from objectstate import ObjectStateRegistry
+from objectstate.object_state_registry import ObjectStateRegistrySubscription
 
 
 @pytest.mark.parametrize(