Fix 'type' object is not subscriptable error

PiperOrigin-RevId: 483363824

Author: Conchylicultor

CHANGELOG.md

@@ -23,6 +23,9 @@ To release a new version (e.g. from `1.0.0` -> `2.0.0`):
 
 ## [Unreleased]
 
+*   Fixed: Compatibility with `edc.dataclass(auto_cast=True)` (fix the `'type'
+    object is not subscriptable` error)
+
 ## [1.2.0] - 2022-10-17
 
 *   Changed: By default, dataclass_array do not cast and broadcast inputs

dataclass_array/array_dataclass.py

@@ -820,7 +820,7 @@ class _ArrayFieldMetadata:
   """
 
   inner_shape_non_static: DynamicShape
-  dtype: Union[array_types.dtypes.DType, type[DataclassArray]]
+  dtype: Union[array_types.dtypes.DType, Type[DataclassArray]]
 
   def __post_init__(self):
     """Normalizing/validating the shape/dtype."""