Awesome project. I see it is based on ZXing. Do you know if it decodes binary data? I see there's support for multiple error correction levels in the qr/qr.go file but I don't see anything related to encoding modes, binary or otherwise. I assume it is defaulting to alphanumeric encoding.

I'm asking because I'm not sure if ZXing supports decoding binary data to begin with. I know zbar doesn't: current versions seem to mangle the output by trying to convert it to UTF-8. I haven't tested ZXing yet.

Also, is it using structured append mode or simply reading normal QR codes in a series and concatenating the data? Structured append mode QR codes have metadata such as an identifier for the sequence they're part of and as well as their position within it.