// 易错点3：必须先判断stack2.length0，再访问stack2.at(-1)（避免栈空时取到undefined）
Numbers and symbols are on the layer above my base layer. Navigation keys, like arrow keys and mouse keys, are on the next layer up. I've made the arrow keys more powerful with tap dance. Tap for left arrow, hold for Ctrl + Left to go back a whole word, tap and hold for Home to go to the beginning of the line, for example.
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if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错
await dropOld.writer.write(chunk1); // ok