def __init__(self, obj=None, parent_uuid=None, names=None):
        self._tupset = set()
        super(CaseSet, self).__init__(obj, parent_uuid, names)
obj: dict, Case, or None
dataset/ETHPy150Open OpenMDAO/OpenMDAO-Framework/openmdao.lib/src/openmdao/lib/casehandlers/caseset.py/CaseSet.__init__