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Anyway, this is perhaps possible. Still, I would say error should be displayed....

Probably the final user wants to read a string as clear as possible, and s/he does not know about UTF8 or internal character codifications that are more devoted to programmer and debugging.
Anyway if it is necessary to have this UTF8 message, I would ask for a function to convert a string to a fully readable one so it would be as complete as possible for an end user.