@cache_readonly(allow_setting=True)
    def is_unique(self):
        return self._engine.is_unique
test salt-key -L --json-out
dataset/ETHPy150Open pydata/pandas/pandas/indexes/base.py/Index.is_unique--crossover with--dataset/ETHPy150Open saltstack/salt/tests/integration/shell/key.py/KeyTest.test_list_json_out