if (diff > 0L) return 1; else if (diff < 0L) return -1; else return 0;
if (diff != 0L) return signOf(diff); diff = this.end - other.end; return signOf(diff);
	public int compareTo(TimestampInterval other) {		long diff = this.begin - other.begin;		if (diff > 0L)			return 1;		else if (diff < 0L)			return -1;		else			return 0;	}