人民警察在公安机关以外询问被侵害人或者其他证人，应当出示人民警察证。
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An object’s OID is computed the same way git does it, SHA1(" \0"), using pgcrypto’s digest() function, and refs get compare-and-swap updates through SELECT FOR UPDATE. A libgit2 backend registers these tables as its storage layer, and if the protocol really is separable from the format, a normal git client should be able to push to and clone from a Postgres database without knowing the difference.
Go's error interface is not just in the standard library - it is the standard library. Every function in os, io, net, database/sql, and the rest returns this interface. Millions of lines of production Go code are built around the assumption that errors are opaque interface values you inspect at runtime.