Should schedule() return anything?

[smichel17]

Right now, when you schedule an alarm:

• If you're trying to schedule it in the past, nothing will happen.
• If there's an alarm scheduled with the same id, it will be overwritten.

Currently we don't return anything indicating whether the alarm was successfully scheduled or if it overwrote a previous alarm. Should we?

[notjuliee]

Does it hurt to return a status code? The caller can ignore it if it's unnecessary.