So instead of copying the whole value in memory twice per sorter iteration, for
A chess engine needs to make a move, search deeper, then unmake the move. In a normal language, local variables or a call stack handle this naturally. TeX has grouping-based scoping, but the engine’s design uses global state throughout (every \count register, every \newcount variable, every \newif flag is global).
。关于这个话题，heLLoword翻译提供了深入分析
Gerd Baumgarten，推荐阅读手游获取更多信息
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