Fix type alias validation

src/draive/parameters/validation.py

@@ -8,7 +8,7 @@
 from collections import abc as collections_abc
 from collections.abc import Callable, Iterable
 from dataclasses import is_dataclass
-from typing import Any, ForwardRef, Protocol, TypeVar, get_args, get_origin
+from typing import Any, ForwardRef, Protocol, TypeAliasType, TypeVar, get_args, get_origin
 
 import typing_extensions
 
@@ -941,6 +941,12 @@ def validated_missing(value: Any) -> Any:
  else:
  return _any_validator(verifier=verifier)
 
+ case type_alias if isinstance(type_alias, TypeAliasType):
+ return _class_instance_validator(
+ annotation=type_alias.__value__,
+ verifier=verifier,
+ )
+
  case class_type if inspect.isclass(class_type):
  return _class_instance_validator(
  annotation=class_type,