@property
    def basedOn_val(self):
        basedOn = self.basedOn
        if basedOn is None:
            return None
        return basedOn.val
Return last good (non-NaN) value in Series if value is NaN for
dataset/ETHPy150Open python-openxml/python-docx/docx/oxml/styles.py/CT_Style.basedOn_val--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/core/series.py/Series.asof