<ul><li>A seemingly trivial request for a refund on a $0 order led to discovering a hidden flaw in the refund system.</li><li>The critical logic preventing incorrect refunds was abstracted and tucked away, causing confusion and inefficiencies.</li><li>Despite a well-thought-out architecture, the actual refund logic was convoluted and scattered across multiple components.</li><li>The overabstraction of business rules led to a lack of visibility and difficulty in debugging.</li><li>Indirection and invisible logic in abstractions caused confusion and hindered developers' ability to understand the system.</li><li>The importance of having clear visibility of crucial behavior in the system to ensure safety and predictability.</li><li>Reevaluating abstractions to bring logic closer to where it impacts the system for better clarity and understanding.</li><li>Fixing the refund bug by relocating the logic back to the refund process and simplifying the system's validation.</li><li>Achieving balance and efficiency by aligning crucial logic with its related processes for smoother operations.</li></ul>

The Abstraction That Hid the Only Logic That Mattered

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