@abc.abstractmethod
    def get(self, item_name, index=None):
When acknowledged, unchanged settings remain unchanged.
dataset/ETHPy150Open nyddle/pystash/pystash/common.py/AbstractStorage.get--crossover with--dataset/ETHPy150Open python-hyper/hyper-h2/test/test_settings.py/TestSettings.test_single_values_arent_affected_by_acknowledgement