I've been writing software for a long time. Long enough to have shipped in languages people don't run anymore, long enough to have made just about every mistake in the book at least once. You'd think that by now the simple bugs would be behind me.
They're not. And this is a story about one of them — written, mostly, for the junior developers who think the dangerous bugs are the complicated ones.
They aren't. Let me explain.
What happened
A flow that very few people use, but where each transaction carries a serious dollar amount, quietly stopped letting anyone complete it. No crash. No alarm. No stack trace begging for attention. Just a validation check that calmly, confidently refused to let people finish.
