[Issue 18326] New: Reals greater than double.max are printed as infinity

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18326

          Issue ID: 18326
           Summary: Reals greater than double.max are printed as infinity
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: major
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: rumbu at rumbu.ro

And reals smaller than double.min_normal * double.epsilon are printed as 0.

real rmax = +0x1.fffffffffffffffep+16383L
real rdbl = double.max;
rdbl *= 2;
real rmin = real.min_normal;

writefln("%a %a %a", rmax, rdbl, rmin)
//outputs inf inf 0x0.0000000000000p+0

Probably because formatting functions in phobos use 64 bit snprintf from MS
Runtime which doesn't support reals.

Related: https://issues.dlang.org/show_bug.cgi?id=9297

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