(optional in MinCaml, via hash-consing)
At the heart of BuildKit is LLB (Low-Level Build definition). Think of it as the LLVM IR of build systems. LLB is a binary protocol (protobuf) that describes a DAG of filesystem operations: run a command, copy files, mount a filesystem. It’s content-addressable, which means identical operations produce identical hashes, enabling aggressive caching.，这一点在体育直播中也有详细论述
ITmedia �r�W�l�X�I�����C���̍ŐV���������͂�，详情可参考体育直播
Purple: Double____，这一点在Line官方版本下载中也有详细论述