DefaultDailyTimerGenerator and WorkHoursTimerGenerator behave differently

[sshu2017]

When I do this:

story_timer_gen = DefaultDailyTimerGenerator(
            clock=self.clock,
            seed=next(self.seeder)
        )

low_activity = story_timer_gen.activity(n=3, per=pd.Timedelta("1 day"))

the low_activity is an integer. But if I use this:

story_timer_gen = WorkHoursTimerGenerator(
                clock=self.clock,
                seed=next(self.seeder),
                start_hour=8,
                end_hour=17)
    
low_activity = story_timer_gen.activity(n=3, per=pd.Timedelta("1 day")),

the low_activity is an tuple, which cause issue downstream in the

activity_gen = NumpyRandomGenerator(
            method="choice",
            a=[low_activity, medium_activity, high_activity],

            # 20% person_a has low activity, 50% has medium, 30% has high.
            p=[0.2, 0.5, 0.3],
            seed=next(self.seeder)
        )

because a is required to be 1-dimensional.

Well, I looked into it again and I am confused. Need some time to investigate and will update this ticket later.