apply suggestion

python/jiminy_py/src/jiminy_py/tree.py

@@ -19,7 +19,6 @@
 from functools import lru_cache
 from itertools import chain, starmap
 from collections.abc import (Mapping, ValuesView, Sequence, Set)
-from collections import OrderedDict
 from typing import (
     Any, Union, Mapping as MappingT, Iterable, Iterator as Iterator, Tuple,
     TypeVar, Callable, Type)
@@ -174,10 +173,19 @@ def _unflatten_as(data: StructNested[Any],
     """
     data_type = type(data)
     if issubclass_mapping(data_type):  # type: ignore[arg-type]
-        return data_type(OrderedDict({  # type: ignore[call-arg]
-            key: _unflatten_as(value, data_leaf_it)
-            for key, value in data.items()  # type: ignore[union-attr]
-        }))
+        try:
+            return data_type([  # type: ignore[call-arg]
+                (key, _unflatten_as(value, data_leaf_it))
+                for key, value in data.items()  # type: ignore[union-attr]
+            ])
+        except (ValueError, RuntimeError):
+            # Fallback to initialisation from dict in the rare event of
+            # a container type not supporting initialisation from a
+            # sequence of key-value pairs.
+            return data_type({  # type: ignore[call-arg]
+                key: _unflatten_as(value, data_leaf_it)
+                for key, value in data.items()  # type: ignore[union-attr]
+            })
     if issubclass_sequence(data_type):  # type: ignore[arg-type]
         return data_type(tuple(  # type: ignore[call-arg]
             _unflatten_as(value, data_leaf_it) for value in data