osu file format v14
[TimingPoints]
// NaN bpm (should be rejected)
0,NaN,4,2,0,100,1,0
// 120 bpm
1000,500,4,2,0,100,1,0
// NaN slider velocity
2000,NaN,4,3,0,100,0,1
// 1.0x slider velocity
3000,-100,4,3,0,100,0,1