Build up validation by chaining multiple checks that each return Result:
We like to believe that we can predict the future. We believe it because it's true, at least in part. Physical systems obey known physical laws and so even fairly complex systems can be understood and predicted with stunning accuracy. Every branch of science makes predictions. Planes fly, servers compute, and dams generate power all through the strength we have to predict the future, if only in the short term. In our human world, we see pollsters predict elections with better-than-random odds, doctors performing research and intervention at global scales, and even disease propagating at predictable rates.
。新收录的资料对此有专业解读
Don’t Derive Copy，更多细节参见新收录的资料
Incrementing ranged search