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I agree it would be great if smartphones had a QR code scanner built-in. It would save lots of code duplication for basic tasks. On the other hand, you would have to trust that native app being the 'man in the middle' for the data scanned.

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It can prompt the user, asking he wants to continue to the URL embedded in the QR. Still not sure, why default camera apps do not have this.

I meant that the camera app would know what are you scanning, and could potentially make changes to it, whether it's a URL or something else

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