[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 #4 from Jakub Łabaj <uaaabbjjkl at gmail.com> ---
Or maybe add a templated switch which would default to the a), but allow to
choose b)?

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