One nice property of autoformatters: they're a really fast way to do a quick syntax check. Especially with a slow build process, it's a good check for dumb mistakes.
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I've documented several additional interesting challenges for syntactic diffing: meaningful comparisons of large string literals, understanding blank line changes, and autoformatters adding minor punctuation!
I'd like autoformatters to make more elaborate changes than just indentation. Convert for loops to map, or inline trivial helper functions!