):
    return {"p": p}


class FormModelOptionalListValidationAlias(BaseModel):
    p: list[str] | None = Field(None, validation_alias="p_val_alias")


@app.post(
    "/model-optional-list-validation-alias",
    operation_id="model_optional_list_validation_alias",
)
def read_model_optional_list_validation_alias(
    p: Annotated[FormModelOptionalListValidationAlias, Form()],
):
    return {"p": p.p}