[Issue 13973] New: Revise Unique implementation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13973

          Issue ID: 13973
           Summary: Revise Unique implementation
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: Phobos
          Assignee: nobody at puremagic.com
          Reporter: andrei at erdani.com

Per http://maikklein.github.io/2015/01/11/Evaluating-D-for-games/ looks there's
a bunch of commented-out code in there that's either not needed anymore or not
functional.

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