=item C<use encoding> needed to upgrade non-Latin-1 byte strings
-By default, there is a fundamental asymmetry in Perl's unicode model:
+By default, there is a fundamental asymmetry in Perl's Unicode model:
implicit upgrading from byte strings to Unicode strings assumes that
they were encoded in I<ISO 8859-1 (Latin-1)>, but Unicode strings are
downgraded with UTF-8 encoding. This happens because the first 256