// Synchronously enqueue — this never applies backpressure
A git repository is a content-addressable object store where objects go in indexed by the SHA1 of their content, plus a set of named references pointing at specific objects by hash. The on-disk format (loose objects as individual files, packfiles as delta-compressed archives with a separate index, a ref store split between a directory of files and a packed-refs flat file with a locking protocol that breaks on NFS) is an implementation detail. The protocol for synchronising objects and refs between repositories is what actually matters, and since git-the-program is just one implementation of it, you can swap the storage backend without clients noticing.
，这一点在同城约会中也有详细论述
Овечкин продлил безголевую серию в составе Вашингтона09:40
（四）吊销公安机关发放的许可证件。
The chancellor is expected to sign a contract with Leonardo – the Italian owner of the former Westland factory in Yeovil, Somerset – to build the new battlefield helicopters, after months of speculation as to whether the historical site would survive.