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x-backend-timestamp as source version\n\nWhen an object PUT to a versioned container overwrites an existing,\nunversioned, object, the unversioned object is copied to the versions\ncontainer. The unversioned object is given a version based on its\ntimestamp. Previously the inverted form of the GET response\nx-timestamp header was used to construct this version. The response\nx-timestamp header is the normal form of the object\u0027s timestamp, which\nwas safe to invert but lacks any extended timestamp information such\nas an offset.\n\nSince the Related-Changes it is safe to invert a Timestamp with an\noffset/hex part. This patch therefore modifies the object versioning\nmiddleware to use the x-backend-timestamp header of the unversioned\nobject GET response to construct its version name. The\nx-backend-timestamp header has the internal format of the object\ntimestamp, so the copied version name now retains all information\nembedded in the source object\u0027s timestamp.\n\nAlso, fix unit tests where the normal format of a PUT request\nx-timestamp is used to generate version-ids for new versions, rather\nthan the internal format. 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