):
    return {"file_size": [len(file) for file in p] if p else None}


@app.post("/optional-list-uploadfile-validation-alias")
def read_optional_list_uploadfile_validation_alias(
    p: Annotated[
        Optional[list[UploadFile]], File(validation_alias="p_val_alias")
    ] = None,
):
    return {"file_size": [file.size for file in p] if p else None}