Today I found a tiny bug of exifr gem. EXIFR::TIFF::Data#readlong raises NoMethodError exception when reading strange image.
I reported this problem by opening new issue for exifr on GitHub. It was first time for me.
https://github.com/remvee/exifr/issues/20
This issue was closed very quickly, but I haven't check whether the latest commit fixes my problem or not. Because I cannot wait new release, and I already fixed this problem by another way.