full. append again has to allocate a new backing store, this time of
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Ultimately, the most rigorous traceability solutions, including QR codes and microchips, won't be useful if people don't actually check them as a condition of making their purchases. Imitators can simply counterfeit QR code labels, for example.
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Compared to the cryptic stack traces common in imperative code, this execution trace makes the source of the error immediately obvious.