[zbentley]

Diffability is not a great argument against YAML/for JSON IMO. Tools can usually handle that for you.

What is the largest concern about YAML is that truncated documents are almost always still valid documents. The likelihood of that happening compared to, say, a git merge gone wrong is much lower, but the consequences are likely much worse.

I don't have a strong opinion on structured data file format, but that's an issue with YAML that often goes unmentioned.