Fix wrong parameter name in namedtuple_dict_structure_factory

HISTORY.md

@@ -11,6 +11,11 @@ The third number is for emergencies when we need to start branches for older rel
 
 Our backwards-compatibility policy can be found [here](https://github.com/python-attrs/cattrs/blob/main/.github/SECURITY.md).
 
+## NEXT
+
+- Fix the `detailed_validation` parameter being passed under the wrong name in {func}`namedtuple_dict_structure_factory <cattrs.cols.namedtuple_dict_structure_factory>`, causing it to be silently ignored.
+  ([#723](https://github.com/python-attrs/cattrs/pull/723))
+
 ## 26.1.0 (2026-02-18)
 
 - Add the {mod}`tomllib <cattrs.preconf.tomllib>` preconf converter.

src/cattrs/cols.py

@@ -277,7 +277,7 @@ def namedtuple_dict_structure_factory(
             cl,
             converter,
             _cattrs_forbid_extra_keys=forbid_extra_keys,
-            _cattrs_use_detailed_validation=detailed_validation,
+            _cattrs_detailed_validation=detailed_validation,
             _cattrs_use_linecache=use_linecache,
             **kwargs,
         )

tests/test_tuples.py

@@ -141,3 +141,31 @@ class Test(NamedTuple):
 
     assert isinstance(exc, ForbiddenExtraKeysError)
     assert exc.extra_fields == {"b"}
+
+
+def test_dict_namedtuples_detailed_validation():
+    """Passing detailed_validation to namedtuple_dict_structure_factory works.
+
+    Regression test for the parameter being passed under the wrong name.
+    """
+
+    class Test(NamedTuple):
+        a: int
+
+    # Create a converter that does NOT use detailed validation by default.
+    c = Converter(detailed_validation=False)
+
+    # But explicitly enable it in the factory.
+    c.register_structure_hook_factory(
+        lambda t: t is Test,
+        lambda t, conv: namedtuple_dict_structure_factory(
+            t, conv, detailed_validation=True
+        ),
+    )
+
+    # With detailed validation, structuring errors should be wrapped
+    # in a ClassValidationError instead of being raised directly.
+    from cattrs.errors import ClassValidationError
+
+    with raises(ClassValidationError):
+        c.structure({"a": "not_an_int"}, Test)