):
    return {"p": p}


class FormModelOptionalAlias(BaseModel):
    p: str | None = Field(None, alias="p_alias")


@app.post("/model-optional-alias", operation_id="model_optional_alias")
async def read_model_optional_alias(p: Annotated[FormModelOptionalAlias, Form()]):
    return {"p": p.p}


@pytest.mark.parametrize(
    "path",
    [
        "/optional-alias",