Remove unused MutableDict._is_none() method

Signed-off-by: Nils Philippsen <nils@tiptoe.de>

diff --git a/lib/sqlalchemy/ext/mutable.py b/lib/sqlalchemy/ext/mutable.py
index 6c87749c5f4337fd1044f05c39c15896405a7ac5..74c80642362201d62ca94ee458271739b17a0bdb 100644 (file)
--- a/lib/sqlalchemy/ext/mutable.py
+++ b/lib/sqlalchemy/ext/mutable.py
@@ -789,9 +789,6 @@ class MutableDict(Mutable, Dict[_KT, _VT]):
     ) -> TypeGuard[_T]:
         return value is not NO_ARG
 
-    def _is_none(self, value: _T | None) -> TypeGuard[None]:
-        return value is None
-
     @overload
     def setdefault(self, key: _KT) -> _VT | None:
         ...