Get_last_statistics returned str, then datetime, now float?!

Development
1

Inside an integration I use homeassistant.components.recorder.statistics.get_last_statistics like this:

        last_inserted_stat = await get_instance(
            self.hass
        ).async_add_executor_job(
            get_last_statistics,
            self.hass,
            1,
            'sensor.xxx',
            True,
            {"sum", "state"},
        )

This returns something like this:

defaultdict(<class 'list'>, {'sensor.xxx': [{'start': 1677708000.0, 'end': 1677711600.0, 'state': 0.071, 'sum': 483.90700000000027}]})

Up to HA core 2022.12 you would get a str as the start and end date. Then up to 2023.3 a datetime.datetime object was returned. And now it is a float - corresponding to the timestamp in UTC.

With all these changes, I fear the integration will break with every release. Do I have to call it in a different way to always get a datetime? Or is there a function that transforms it always into a datetime, no matter what is returned?