For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
Что думаешь? Оцени!。关于这个话题，新收录的资料提供了深入分析
Number: All the pips in this space must add up to the number.，这一点在新收录的资料中也有详细论述
let next = oneStep step.state;