https://github.com/joblib/joblib/blob/c98b6944cfa4d65409e9092afa54a6bd505b9350/joblib/_store_backends.py#189 ...which is not always true. Would need to add 'compress' to the abstract sig https://github.com/joblib/joblib/blob/c98b6944cfa4d65409e9092afa54a6bd505b9350/joblib/_store_backends.py#L122