def _delete_value(self, entity):
    entity._entity_key = None
No package, write perms, user
dataset/ETHPy150Open GoogleCloudPlatform/datastore-ndb-python/ndb/model.py/ModelKey._delete_value--crossover with--dataset/ETHPy150Open mathcamp/pypicloud/tests/test_simple.py/TestCache.test_no_package_write_user