Optional instead of | union

matrix_appservice_kakaotalk/kt/types/bson.py

@@ -13,7 +13,7 @@
 #
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
-from typing import Any
+from typing import Any, Optional
 
 from mautrix.types import Serializable, JSON
 
@@ -26,5 +26,5 @@ class Long(int, Serializable):
     def deserialize(cls, raw: JSON) -> "Long":
         return cls(raw)
 
-def to_optional_long(x: Any | None) -> Long | None:
+def to_optional_long(x: Optional[Any]) -> Optional[Long]:
     return Long(x) if x is not None else None