Spend time distilling good invariants because they serve you in many ways. They guide you as you explore protocol variants (see mental model 5), telling you what you can and cannot change. They act as contracts when you compose components, defining what each part guarantees to the others. They translate directly into runtime assertions and test oracles for your implementation. And they are essential for adding fault-tolerance: once you know the invariant, you know where you need to recover to after a fault, and you can design recovery actions to reestablish it.
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