def __value_del(self):
        self.delete()
A list of PETSc ISes defining the global indices for each set in
dataset/ETHPy150Open evennia/evennia/evennia/server/models.py/ServerConfig.__value_del--crossover with--dataset/ETHPy150Open OP2/PyOP2/pyop2/petsc_base.py/DataSet.field_ises