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

[d-bugmail at puremagic.com]

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

--- Comment #3 from Berni44 <bugzilla at bernis-buecher.de> ---
(In reply to ag0aep6g from comment #2)
> That's just more reason for writeln not to print them. Reopening. Please
> read issues more carefully before closing them.

Sorry. My focus was on the "should print" section, which is definitively not,
what it should print anymore. So maybe this should be renamed to "writeln
should not print hex strings?"

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