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errors.Is definitely doesn't use string comparison internally: https://cs.opensource.google/go/go/+/refs/tags/go1.24.3:src/errors/wrap.go;l=27-78 https://cs.op

• masklinn 1y ago
  Of course it does. What do you think an errors.New contains and how do you figure it compares by value when checking placeholder errors? The answer is that errors.New just wraps the error message in an errorString struct, and the second line of `is` is a string comparison.
  • kiitos 1y ago
    See for yourself: https://go.dev/play/p/Q7IPuPS5CwQ https://go.dev/play/p/Q7IPuPS5CwQ
    • masklinn 1y ago
      Oh hell, I always forget equality doesn't go through pointers in go, you're right. And as you demonstrate I could have tested it easily enough to confirm I was reading the code correctly...