item_def["description"] = item_description
    new_mapping, new_definitions = _remap_definitions_and_field_mappings(
        model_name_map=model_name_map,
        definitions=definitions,  # type: ignore[arg-type]
        field_mapping=field_mapping,
    )
    return new_mapping, new_definitions


def _replace_refs(
    *,
    schema: dict[str, Any],

from collections.abc import Sequence
from typing import Any, Optional, Union, cast

from fastapi import routing
from fastapi._compat import (
    ModelField,
    Undefined,
    get_compat_model_name_map,
    get_definitions,
    get_schema_from_model_field,
    lenient_issubclass,
)
from fastapi.datastructures import DefaultPlaceholder
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (