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-rw-r--r--lib/sqlalchemy/util/_py_collections.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/sqlalchemy/util/_py_collections.py b/lib/sqlalchemy/util/_py_collections.py
index 725f6930e..40f515671 100644
--- a/lib/sqlalchemy/util/_py_collections.py
+++ b/lib/sqlalchemy/util/_py_collections.py
@@ -136,7 +136,7 @@ class OrderedSet(Set[_T]):
_list: List[_T]
- def __init__(self, d=None):
+ def __init__(self, d: Optional[Iterable[_T]] = None) -> None:
if d is not None:
self._list = unique_list(d)
super().update(self._list)