Due to the use of bindable flow provided by `BeatmapDifficultyCache` in
this usage, the display would briefly flash to zero while difficulty
calculation was still running (as there is no way for a consumer of the
provided bindable to know whether the returned 0 is an actual 0 SR or a
"pending" calculation).
While I hope to fix this by making the bindable flow return nullable
values, I think this particular use case works better with non-bindable
flow so have switched across to that.
In some cases, applying the Difficulty Adjust mod without actually
changing any of the settings previously caused the bar in song select
beatmap details to appear red/blue instead of staying white.
This was caused by not accounting for floating-point imprecisions when
determining bar colour in AdvancedStats. To resolve, first check
equality with tolerance, and only then apply blue/red colours if that
equality check does not hold.