Merge holiday calendars together. The base calendar
        will take precedence to other. The merge will be done
        based on each holiday's name.

        Parameters
        ----------
        base : AbstractHolidayCalendar
          instance/subclass or array of Holiday objects
        other : AbstractHolidayCalendar
          instance/subclass or array of Holiday objects

def merge_class(base, other):
        """
        Merge holiday calendars together. The base calendar
        will take precedence to other. The merge will be done
        based on each holiday's name.

        Parameters
        ----------
        base : AbstractHolidayCalendar
          instance/subclass or array of Holiday objects
        other : AbstractHolidayCalendar
          instance/subclass or array of Holiday objects
        """
        try:
            other = other.rules
        except AttributeError:
            pass

        if not isinstance(other, list):
            other = [other]
        other_holidays = {holiday.name: holiday for holiday in other}

        try:
            base = base.rules
        except AttributeError:
            pass

        if not isinstance(base, list):
            base = [base]
        base_holidays = {holiday.name: holiday for holiday in base}

        other_holidays.update(base_holidays)
        return list(other_holidays.values())