Must achieve = 99% accuracy on 10,000 random test pairs (held-out, fixed seed)
* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
，这一点在搜狗输入法下载中也有详细论述
"I have more stability. I'm able to have the energy to talk to people [about the abuse], which I could not have done… even, like, a couple years ago."
Good battery life