chore(internal): add type construction helper (#613)

src/anthropic/_models.py

@@ -406,6 +406,15 @@ def build(
     return cast(_BaseModelT, construct_type(type_=base_model_cls, value=kwargs))
 
 
+def construct_type_unchecked(*, value: object, type_: type[_T]) -> _T:
+    """Loose coercion to the expected type with construction of nested values.
+
+    Note: the returned value from this function is not guaranteed to match the
+    given type.
+    """
+    return cast(_T, construct_type(value=value, type_=type_))
+
+
 def construct_type(*, value: object, type_: object) -> object:
     """Loose coercion to the expected type with construction of nested values.