[Issue 15888] New: std.format generates broken hex strings for wchar[] and dchar[] with invalid values

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15888

          Issue ID: 15888
           Summary: std.format generates broken hex strings for wchar[]
                    and dchar[] with invalid values
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: ag0aep6g at gmail.com

----
void main()
{
    import std.stdio: writeln;

    ushort[] a = [0xFF_FE, 0x42];
    writeln([cast(wchar[]) a]);

    uint[] b = [0x0F_FF_FF_FF, 0x42];
    writeln([cast(dchar[]) b]);
}
----

Prints:
----
[x"FFFE 42"w]
[x"FFFFFFF 42"d]
----

Should print something like this:
----
[x"FEFF 4200"w]
[x"FFFFFF0F 42000000"d]
----

Or, since endianess matters:
----
[[wchar(0xFFFE), 0x42]]
[[dchar(0xFFFFFFF), 0x42]]
----

Mind issue 15887, though.

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