[phobos] UTF-8 string slicing

[unDEFER]

Hello!

D language specification says that it supports UTF-8 strings, but I can't
find how to slice UTF-8 string by character index, not by bytes numbers.
Why there is no simple slice function in std.utf like attached code?

Thank you in advance.

-- 
Nikolay Krivchenkov aka unDEFER
registered Linux user #360474
Don't worry, I can read OpenOffice.org
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