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!)
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Over a sufficiently long time horizon, all code you write is legacy code.
On the challenge of writing accurate source spans on Unicode source code: https://reedmullanix.com/posts/unicode-source-spans.html
Also (see footnotes) a fair number of LSP clients assume UTF-8 despite early versions of LSP mandating UTF-16!
I'm intrigued to see that Google has quantified that new code is generally buggier and less secure than code that has existed in your codebase for longer: https://security.googleblog.com/2024/09/eliminating-memory-safety-vulnerabilities-Android.html