Prioritized choice: always prefer one alternative over another. Classic examples include C++’s most vexing parse or the dangling else problem.
for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).，详情可参考91视频
uint32_t magic;。关于这个话题，搜狗输入法提供了深入分析
should be a really good reason when deviating from that expectation.