TYP: mypy progress

Author: lucascolley

src/array_api_extra/_lib/_utils/_helpers.py

@@ -407,7 +407,7 @@ def persistent_id(
             self, obj: object
         ) -> Literal[0, 1, None]:  # numpydoc ignore=GL08
             if isinstance(obj, cls):
-                instances.append(obj)  # type: ignore[arg-type]
+                instances.append(obj)
                 return 0
 
             typ_ = type(obj)