Please do not propagate the trap of using is_utf8 for Perl code. It does not indicate if the string you have is UTF-8 encoded bytes. It is only an internal flag for Perl's own use and XS code. It is possible, especially after people try hacks like this, or write incomplete XS code, to have byte-strings where is_utf8 is true, and character strings where is_utf8 is false. I would link to some RT bugs for more reading about the issue, but the website doesn't allow me to post them.

In reply to Re^2: RT::Client turns occasional binary characters in to wide characters by Anonymous Monk
in thread RT::Client turns occasional binary characters in to wide characters by wardmw

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