Why is the git staging area called a cache? https://stackoverflow.com/questions/6716355/why-staging-directory-is-also-called-index-git-index/6718135#6718135
Interesting git archaeology, but I'm not sure that makes it a good name.
miniblog.
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The origins of XXX as FIXME https://www.snellman.net/blog/archive/2017-04-17-xxx-fixme/ (lisp machines, early Unix, and proper code archaeology!)