bug: issue with repr in list types

[tlambert03]

when getting repr on OME.structured_annotations

File ~/mambaforge/envs/ome-types/lib/python3.11/site-packages/rich/pretty.py:887, in traverse(_object, max_length, max_string, max_depth)
    884     node.is_namedtuple = _is_namedtuple(obj)
    885     return node
--> 887 node = _traverse(_object, root=True)
    888 return node

File ~/mambaforge/envs/ome-types/lib/python3.11/site-packages/rich/pretty.py:683, in traverse.<locals>._traverse(obj, root, depth)
    681 push_visited(obj_id)
    682 angular = getattr(obj.__rich_repr__, "angular", False)
--> 683 args = list(iter_rich_args(rich_repr_result))
    684 class_name = obj.__class__.__name__
    686 if args:

File ~/mambaforge/envs/ome-types/lib/python3.11/site-packages/rich/pretty.py:650, in traverse.<locals>._traverse.<locals>.iter_rich_args(rich_args)
    649 def iter_rich_args(rich_args: Any) -> Iterable[Union[Any, Tuple[str, Any]]]:
--> 650     for arg in rich_args:
    651         if _safe_isinstance(arg, tuple):
    652             if len(arg) == 3:

File ~/mambaforge/envs/ome-types/lib/python3.11/site-packages/pydantic/_internal/_repr.py:72, in Representation.__rich_repr__(self)
     70 def __rich_repr__(self) -> RichReprResult:
     71     """Used by Rich (https://rich.readthedocs.io/en/stable/pretty.html) to pretty print objects."""
---> 72     for name, field_repr in self.__repr_args__():
     73         if name is None:
     74             yield field_repr

File ~/dev/self/ome-types/src/ome_types/_mixins/_base_type.py:136, in OMEType.__repr_args__(self)
    134 """Repr with only set values, and truncated sequences."""
    135 args = []
--> 136 for k, v in model_dump(self, exclude_defaults=True).items():
    137     if k == "kind":
    138         continue

AttributeError: 'list' object has no attribute 'items'