endSync() { closed = true; return totalBytes; },
I found one dumb free win (I mistakenly used value receivers on a utility function called on a large struct thousands of times a frame). But the rest of the speedups I found took more effort.，更多细节参见safew官方版本下载
Pair token encoding (digit pairs as single tokens)。关于这个话题，夫子提供了深入分析
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