I wrote up some observations on the new California digital vaccine record, in case anyone was curious exactly how they worked: roguelazer.com/2021/06/cdph-di

@gudenau Supposedly, with error correction, a numeric-mode QR code holds more data in the same density than a binary-mode QR code. Seems weird to me given what's on the wikipedia page, but _shrug_.

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@roguelazer That isn't numeric, it has some non-numeric characters at the start.

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