这种方法通过类型别名和转换器封装了平台差异，避免了平台侧重复编写转换逻辑。
The result from Step 2 is a high-level route – a sequence of shortcuts connecting border points.
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"It was very painful, it felt like you've been hit by a bus," she said. "Nothing would prepare you to understand how much pain I was in."
The series of Command objects generated by the pipeline is then run by an interpreter using runEffect(checkoutFlow(cartSummary)). Because our business logic consists of pure functions that interact with the world only through data, we can record those interactions simply by adding a few hooks for services like OpenTelemetry. And if we can record them, we can replay them deterministically. Best of all, there’s no need to mock a single database or external service.