tasks killed via task.unique do not call done_callbacks

[dlashua]

@time_trigger('startup')
def startup_delayed():
    log.info('starting')
    task.sleep(2)
    my_task = task.create(do_stuff, 5)
    task.add_done_callback(my_task, all_done, 'delayed')

@time_trigger('startup')
def startup_normal():
    log.info('starting')
    my_task = task.create(do_stuff, 5)
    task.add_done_callback(my_task, all_done, 'normal')

def do_stuff(secs):
    task.unique('testing123')
    log.info(f'sleeping {secs}')
    task.sleep(secs)
    log.info(f'done sleeping {secs}')

def all_done(name):
    log.info(f'task has ended {name}')

In the above code, all_done is never called for normal since the task.unique from the delayed process kills that task.