[Issue 7054] std.format.formattedWrite uses code units count as width instead of characters count

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=7054

--- Comment #3 from hsteoh at quickfur.ath.cx ---
Tried to fix this today, unfortunately it's blocked by std.uni.byGrapheme being
impure, which causes a ripple of impurity down the call chain causing several
unittest compile errors and CTFE errors.

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