@decorators.passthru_decorator
    def function(self, arg):
        return arg
This will be tested in a round about way since MATLAB fails when
dataset/ETHPy150Open GrahamDumpleton/wrapt/tests/test_instancemethod.py/NewClass1.function--crossover with--dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/emplike/tests/test_descriptive.py/TestDescriptiveStatistics.test_ci_skew