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mbr_uid_to_uuid(3) on macOS

The text a66a296dc8e7, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.

user and group identifier translation functions

mbr_uid_to_uuid(3) on macOS now