Error not raised when constructing a SoundSequence with end_with_interval=True and too long sound

[Jellevanderwerff]

The doesn't raise a helpful error:

seq = thebeat.Sequence([500, 500, 10], end_with_interval=True)
s = thebeat.SoundStimulus.generate(duration_ms=50)
ss = thebeat.SoundSequence(s, seq)

Whereas this does:

seq = thebeat.Sequence([10, 500, 500], end_with_interval=False)
s = thebeat.SoundStimulus.generate(duration_ms=50)
ss = thebeat.SoundSequence(s, seq)

[Jellevanderwerff]

Also ran into a frame rounding error that wasn't caught/warned and rounded. Cannot reproduce now but raises a NumPy ValueError like "shape (2501,) couldn't be broadcast into shape (2500,)", or the other way around.