GraphQL is a really elegant way of querying a datastore, instead of REST or SQL. Eg https://waywardmonkeys.org/2016/03/15/graphql-beyond-the-web/ (querying OS metadata example)
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I've just squeezed another 5% of performance out of difftastic by finding a few HashSet values that weren't FxHashSet.
I do wonder whether hash DoS resistance is a good default. Sure, Rust programs are often pretty fast anyway, but it feels like a different threat model to the rest of Rust.