Trace the Bug Before the Fix

Bug report Checkout sometimes charges shipping twice on carts with a promotion and address edit. The wrong first move can hide the duplicate charge without fixing the path that creates it. Debugging loop Reproduce -> Hypothesize -> Pin -> Patch Treat the bug as evidence, not as an invitation to edit the nearest line. Patch first Fast but blind A fix with a guard against regression Every step should either reduce uncertainty or preserve the lesson. 01 Reproduce 02 Hypothesis 03 Regression Step 1 You have one customer report and noisy logs.

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