https://issues.dlang.org/show_bug.cgi?id=20263

          Issue ID: 20263
           Summary: Wrong value for CustomFloat.min_exp
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: dlang@croco-puzzle.com

CustomFloat!(5, 2).min_exp should be 0, not 4294967297.

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