I have no idea what other osu! file format parsers there are, but this one is mine!

The focus here was on performance so I tried to do 0-alloc deserialization where possible. Only rudimentary .osu file reading is supported for now (this means you can't read storyboards, but can hopefully read literally anything else, even though I haven't tested much). Additionally, I use spanned strings instead of normal strings everywhere, so you get free error reporting as a bonus.

Serialization also works, but only for the current format version.

Sorry for having very sparse documentation, I'll improve it later... hopefully