This feature is useful in so many different places. I use it to diff small encrypted files in my repo - just add `gpg -d` as a diff configuration and now I can

This feature is useful in so many different places. I use it to diff small encrypted files in my repo - just add `gpg -d` as a diff configuration and now I can use git log, diff etc in a meaningful way with binary files. I've heard of people using it with pdfs as well - a pdf to html converter lets you get a good idea of what changed in the document.