优势：时间复杂度O(n+k)，k为数据范围
operated on a stack-backed slice up to the return point.
，这一点在搜狗输入法2026中也有详细论述
When you write a Dockerfile, the Dockerfile frontend parses it and emits LLB. But nothing in BuildKit requires that the input be a Dockerfile. Any program that can produce valid LLB can drive BuildKit.
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