[Issue 16210] std.utf.byUTF can be made into a bidirectional range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16210

--- Comment #3 from Jakub Łabaj <uaaabbjjkl at gmail.com> ---
Or we should implement another function e.g. byCodePoint which would behave as
we want in all cases? For me it seems a better solution than function logic
dependent on argument's type.

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