import inspect
from contextlib import AsyncExitStack, contextmanager
from copy import copy, deepcopy
from typing import (
    Any,
    Callable,
    Coroutine,
    Dict,
    ForwardRef,
    List,
    Mapping,
    Optional,
    Sequence,
    Tuple,
    Type,
    Union,
    cast,
)

import anyio
from fastapi import params
from fastapi._compat import (
    PYDANTIC_V2,
    ErrorWrapper,
    ModelField,

import asyncio
import dataclasses
import email.message
import inspect
import json
from contextlib import AsyncExitStack
from enum import Enum, IntEnum
from typing import (
    Any,
    Callable,
    Coroutine,
    Dict,
    List,
    Optional,
    Sequence,
    Set,
    Tuple,
    Type,
    Union,
)

from fastapi import params
from fastapi._compat import (
    ModelField,
    Undefined,

* ♻️ Update internal type annotations and upgrade mypy. PR [#9658](https://github.com/tiangolo/fastapi/pull/9658) by [@tiangolo](https://github.com/tiangolo).
* ♻️ Simplify `AsyncExitStackMiddleware` as without Python 3.6 `AsyncExitStack` is always available. PR [#9657](https://github.com/tiangolo/fastapi/pull/9657) by [@tiangolo](https://github.com/tiangolo).

### Upgrades