https://issues.dlang.org/show_bug.cgi?id=20262

          Issue ID: 20262
           Summary: CustomFloat.mant_dig
           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).mant_dig should be 5, not 6. If storeNormalized is not set,
it should be 4.

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