and isinstance(update_dict[key], list)
        ):
            main_dict[key] = main_dict[key] + update_dict[key]
        else:
            main_dict[key] = value


def get_value_or_default(
    first_item: Union[DefaultPlaceholder, DefaultType],
    *extra_items: Union[DefaultPlaceholder, DefaultType],
) -> Union[DefaultPlaceholder, DefaultType]:
    """

    WebSocketRequestValidationError,
)
from fastapi.types import DecoratedCallable, IncEx
from fastapi.utils import (
    create_cloned_field,
    create_response_field,
    generate_unique_id,
    get_value_or_default,
    is_body_allowed_for_status_code,
)
from pydantic import BaseModel
from starlette import routing
from starlette.concurrency import run_in_threadpool
from starlette.exceptions import HTTPException