10.33Idempotency alone doesn't solve stale ordering

Important nuance.

Suppose:

event 2 = Suspended
event 1 = Active

Both are idempotent.

If event 1 arrives last, you still end up wrong.

You may need:

version = 17

and reject:

version < currentVersion

So:

idempotency

handles duplicates.

version/order control

handles stale events.

Different problems.