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Detect use of lossy compression in RAF

Is there a way to tell if a Fuji RAF file is using lossy compression? (Such as from the GFX-100 or X-T4.)

I get LIBRAW_IO_ERROR returned from unpack(), but I don't want to rely on that -- it could mean other things besides lossy compression. Ideally I'd like to check something in libraw_data_t that says what kind of compression it is, or even just a more general "not supported" indication.