Though the code appears slightly different, it should be semantically
equivalent. APIUser equality is implemented on `Id` and `Host` should
never transition from non-null to null.
This one is super duper annoying to test, because we already have e.g.
`TestScenePlaylistsScreen`. The only way to test it would be to use an
`OsuGameTestScene`.
Maybe this is okay?
This is important as the format will be used more when lazer beatmap
submission comes online, and its stability is a useful property for
that.
Included archive contains an `.osu` with a few fractional-millisecond
timing points and objects, as well as a multi-segment-type slider. That
should cover the range of all possible modifications that the
compatibility exporter currently performs.