I tried utf8::downgrade with FAIL_OK set to 1

    my $success = utf8::downgrade($string, 1);
    return($string);
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It didn't seem to do anything
given Güldenstädt’s Redstart
it returned Güldenstädt’s Redstart

If I set FAIL_OK to 0, it died, with

    Wide character in subroutine entry
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RichardH