tiny fix :)

src/dabmodel/model.py

@@ -657,7 +657,7 @@ class BaseMeta(type):
         obj = super().__call__(*args, **kw)
 
         for _fname, _fvalue in cls.__DABSchema__.items():
-            setattr(obj, _fname, _fvalue)
+            setattr(obj, _fname, _fvalue.value)
         inst_schema: dict[str, Any] = {}
         for _fname, _fvalue in cls.__DABSchema__.items():
             inst_schema[_fname] = FrozenDABField(_fvalue)