Your Recursion Is Lying to You About Stack Safety

Recursion is one of those ideas developers learn early and trust for years. If the recursive step is simple and the base case is correct, the code feels clean and safe.

It is elegant for a reason: many problems are naturally recursive, and the code often mirrors how we explain the logic out loud. For tree walks, nested structures, and divide-and-conquer patterns, recursion can be easier to read than explicit loops.

The catch is physical limits. Even with a correct base case and sound logic, each recursive call still consumes stack space. At some depth, you crash with stack overflow.

If you read Your Debounce Is Lying to You and Your Throttling Is Lying to You, this is the recursion version of the same pattern: elegant abstraction, hidden operational edge.

Problem Setup: Recursion Hits The Wall

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