https://issues.dlang.org/show_bug.cgi?id=21859

          Issue ID: 21859
           Summary: [std.format]
           Product: D
           Version: D2
          Hardware: All
               URL: http://dlang.org/phobos/
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: golovanov_alexey@mail.ru

'u' FormatChar not documented, but used in phobos (std/format.d, std/string.d,
std/zip.d)

--