miniblog.

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.

`init` feels like an unhelpful name in OO. It doesn't give you an initial value, it initialises the instance that has already been created. Developers are often surprised that init doesn't return the instance, because they have a strong association with `new Foo()`. Perhaps `finish` would have been a less confusing name?

I'm always hesitant when I see digital services funded by a single one-off payment. Running a service requires ongoing funding. You sometimes see this with games that have a multiplayer component. People buy the game, but the multiplayer servers won't last forever.