I meant: What use do you have for is_utf8? I find it's usually used where the following should be used: 

utf8::downgrade($s, 1)
    or croak("Wide characters in foo argument");

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In reply to Re^3: good way to implement utf8::is_utf8 for perl 5.8.0 by ikegami
in thread good way to implement utf8::is_utf8 for perl 5.8.0 by perl5ever

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