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python-attrs · Oct 27, 2024 · 7e9de9a · 7e9de9a
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diff --git a/docs/defaulthooks.md b/docs/defaulthooks.md
@@ -214,6 +214,10 @@ defaultdict(<function <lambda> at ...>, {'key': 1})
 
 `defaultdicts` are unstructured into plain dictionaries.
 
+```{note}
+`defaultdicts` are not supported by the BaseConverter.
+```
+
 ```{versionadded} 24.2.0
 
 ```

diff --git a/src/cattrs/converters.py b/src/cattrs/converters.py
@@ -1172,7 +1172,9 @@ def __init__(
         self.register_structure_hook_factory(is_annotated, self.gen_structure_annotated)
         self.register_structure_hook_factory(is_mapping, self.gen_structure_mapping)
         self.register_structure_hook_factory(is_counter, self.gen_structure_counter)
-        self.register_structure_hook_factory(is_defaultdict, defaultdict_structure_factory)
+        self.register_structure_hook_factory(
+            is_defaultdict, defaultdict_structure_factory
+        )
         self.register_structure_hook_factory(is_typeddict, self.gen_structure_typeddict)
         self.register_structure_hook_factory(
             lambda t: get_newtype_base(t) is not None, self.get_structure_newtype