[Miniflare] miniflare.setOptions removes alarm from storage in v3

[SamyPesse]

We observed that calling miniflare.setOptions on a worker where a durable object had an alarm set (using state.storage.setAlarm), removes it and state.storage.getAlarm returns null after the DO has been reinitialized.

[mrbbot]

Hey! 👋 Thanks for raising for this. workerd doesn't support persisting alarms to disk yet (#605 (comment)), so they'll get cleared whenever you restart workerd (new Miniflare()/Miniflare#setOptions()). Would you be able to explain your use case here? This is something we could potentially add...

[SamyPesse]

We use setOptions to simulate a durable object being reset (and its memory reset). It helps ensures we don't write logic that depends on the memory when it should be reliable to restarts.

[mrbbot]

Hey! 👋 I'm going to transfer this to workers-sdk as that's the new home for Miniflare 3, and that will make it easier for us to track this. 👍

[penalosa]

Transferring this to workerd since I think the right solution here will probably involve workerd persisting alarms to disk along with durable object storage