Debugging Emacs memory leaks: https://notes.secretsauce.net/notes/2015/09/19_debugging-gnu-emacs-memory-leaks-part-1.html (reproduction, measurement and bisection!)
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Rust has a lot of integer types, but I kinda like distinguishing u64 from usize. It communicates intent.
A usize is probably going to be used as an index, whereas a u64 is probably just a measurement of something.