[Issue 14519] Get rid of unicode validation in string processing

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14519

--- Comment #33 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
Removing autodecoding is good, but this issue is about making autodecode
@nothrow @nogc.

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