def get_value_or_default(
    first_item: DefaultPlaceholder | DefaultType,
    *extra_items: DefaultPlaceholder | DefaultType,
) -> DefaultPlaceholder | DefaultType:
    """
    Pass items or `DefaultPlaceholder`s by descending priority.

    The first one to _not_ be a `DefaultPlaceholder` will be returned.

    Otherwise, the first item (a `DefaultPlaceholder`) will be returned.
    """

    ) -> Mapping[str, Any]:
        from ._compat.v2 import with_info_plain_validator_function

        return with_info_plain_validator_function(cls._validate)


class DefaultPlaceholder:
    """
    You shouldn't use this class directly.

    It's used internally to recognize when a default value has been overwritten, even
    if the overridden default value was truthy.
    """

    if isinstance(response_class, DefaultPlaceholder):
        actual_response_class: type[Response] = response_class.value
    else:
        actual_response_class = response_class
    is_sse_stream = lenient_issubclass(actual_response_class, EventSourceResponse)
    if isinstance(strict_content_type, DefaultPlaceholder):
        actual_strict_content_type: bool = strict_content_type.value
    else:

    ModelField,
    get_definitions,
    get_flat_models_from_fields,
    get_model_name_map,
    get_schema_from_model_field,
    lenient_issubclass,
)
from fastapi.datastructures import DefaultPlaceholder, _Unset
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (
    _get_flat_fields_from_params,
    get_flat_dependant,
    get_flat_params,
    get_validation_alias,
)

from enum import Enum
from typing import Annotated, Any, TypeVar

from annotated_doc import Doc
from fastapi import routing
from fastapi.datastructures import Default, DefaultPlaceholder
from fastapi.exception_handlers import (
    http_exception_handler,
    request_validation_exception_handler,
    websocket_request_validation_exception_handler,
)
from fastapi.exceptions import (

### Docs