TL;DR The most expensive bug I hit yesterday wasn't a crash. It was a stub that answered politely. Four shapes of the same problem: a column nobody writes to, a model nobody calls, an engine backed by a fake, and a resolver that falls back to a null implementation silently .
Source: [Dev.to](https://dev.to/nasrulhazim/which-parts-of-this-are-real-should-be-a-question-with-an-answer-2a2j)