mdbook is a popular tool for Rust projects to document how they work: https://github.com/rust-lang/mdBook/
I suspect the name really helps: "writing a book" sounds much more impressive than "writing some docs"!
miniblog.
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I carefully document `cargo install --locked` for difftastic users, I carefully use `--locked` for CI, and I've just realised that all my release builds totally ignore it! Oops.
Anyone using my prebuilt binaries have been getting different Unicode width calculations in display.
I'm a huge fan of Swift's 'Error Handling Rationale' design document: https://github.com/swiftlang/swift/blob/9315673c003875158852579bd1f33480cdec5461/docs/ErrorHandlingRationale.md#fundamentals
It carefully defines terminology and compares with other languages, so you can understand Swift's position and preference in the design space.
Fun example of a bunch of YAML gotchas all in a single file: