A bug in the code that we have to ignore
Summary
This article explains a recurring code pattern that triggers PVS-Studio warning V7001 in JavaScript and TypeScript projects. It shows examples from pdf.js and other codebases where duplicate or equivalent bit-shift operands appear in flag definitions and expressions. The piece argues that these cases often come from copy-paste mistakes or low-risk legacy code, so teams sometimes choose to ignore the warning. It also highlights the tension between keeping code clean and avoiding noise in static analysis results.
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