[Issue 18258] New: std.math.NaN redesign

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18258

          Issue ID: 18258
           Summary: std.math.NaN redesign
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: rumbu at rumbu.ro

The current signature allows creation only for real NaNs with payloads. It's
impossible to create float or double NaNs with a payload.

Proposal:

Redesign NaN to allow creation of other floating point types:
T NaN(T = real, U)(const U payload) if (isFloatingPoint!T && isUnsigned!U)

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