这三条路径，本质上对应的是三种不同的“时间观”。第一种押长期制造能力，第二种押资本放大效应，第三种押全球资源整合速度。
The setter deduplicates by equality: if the new value == the current value, no notification fires. This works well for enums, strings, and ints, but mutating a mutable object in place and reassigning the same reference won't trigger consumers (because obj == obj is trivially True). Stick to immutable values and this isn't a concern.
，这一点在下载安装汽水音乐中也有详细论述
Обвинения США против Ирана описали фразой «строят самолет в процессе полета»08:51
from this list, the two reasonable options are either DFAs (best choice if you can compile ahead of time) or lazy DFAs (great for both random user input and large regexes). NFAs are just not competitive in reality, and backtracking engines are a security nightmare.