"user": {"username": "Dave"},
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "importance": 2,
        "item": {
            "name": "Foo",
            "price": 50.5,
            "description": None,
            "tax": None,
        },
        "user": {"username": "Dave", "full_name": None},
    }

* ✏️ Fix typo in README installation instructions. PR [#13011](https://github.com/fastapi/fastapi/pull/13011) by [@dave-hay](https://github.com/dave-hay).
* 📝 Update docs for `fastapi-cli`. PR [#13031](https://github.com/fastapi/fastapi/pull/13031) by [@tiangolo](https://github.com/tiangolo).

### Translations

from pydantic_core import PydanticUndefinedType

from ._compat import (
    Url,
    is_pydantic_v1_model_instance,
)


# Taken from Pydantic v1 as is
def isoformat(o: Union[datetime.date, datetime.time]) -> str:
    return o.isoformat()


# Adapted from Pydantic v1
# TODO: pv2 should this return strings instead?
def decimal_encoder(dec_value: Decimal) -> Union[int, float]:
    """

                            },
                            {
                                "name": "save-data",
                                "in": "header",
                                "required": True,
                                "schema": {"type": "boolean", "title": "Save Data"},
                            },
                            {
                                "name": "if-modified-since",

                            },
                            {
                                "name": "save-data",
                                "in": "header",
                                "required": True,
                                "schema": {"type": "boolean", "title": "Save Data"},
                            },
                            {
                                "name": "if-modified-since",

        "traceparent": "123",
        "x_tag": ["one", "two"],
    }


def test_header_param_model_no_underscore(client: TestClient):
    response = client.get(
        "/items/",
        headers=[
            ("save-data", "true"),
            ("if-modified-since", "yesterday"),
            ("traceparent", "123"),
            ("x-tag", "one"),
            ("x-tag", "two"),
        ],
    )
    assert response.status_code == 422

                                "type": "string",
                                "format": "date-time",
                            },
                            "end_datetime": {
                                "title": "End Datetime",
                                "type": "string",
                                "format": "date-time",
                            },
                            "repeat_at": {

                "id": 999,
                "name": "Dead Pond",
                "age": 30,
                "secret_name": "Dive Wilson",
            },
        )
        assert response.status_code == 200, response.text
        assert response.json() == snapshot(
            {"age": 30, "secret_name": "Dive Wilson", "id": 999, "name": "Dead Pond"}
        )

        # Read a hero
        hero_id = response.json()["id"]

        {
            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/items/": {
                    "post": {
                        "summary": "Save Union Body Discriminator",
                        "operationId": "save_union_body_discriminator_items__post",
                        "parameters": [
                            {
                                "name": "q",

                    "operationId": "read_items_items__get",
                    "parameters": [
                        {
                            "description": "Query string for the items to search in the database that have a good match",
                            "required": False,
                            "deprecated": True,
                            "schema": {
                                "anyOf": [