=item *
+The C<cmp> (and hence C<sort>) operators do not necessarily give the
+correct results when both operands are UTF-EBCDIC encoded strings and
+there is a mixture of ASCII and/or control characters, along with other
+characters.
+
+=item *
+
+Ranges containing C<\N{...}> in the C<tr///> (and C<y///>)
+transliteration operators are treated differently than the equivalent
+ranges in regular expression pattersn. They should, but don't, cause
+the values in the ranges to all be treated as Unicode code points, and
+not native ones. (L<perlre/Version 8 Regular Expressions> gives
+details as to how it should work.)
+
+=item *
+
Not all shells will allow multiple C<-e> string arguments to perl to
be concatenated together properly as recipes in this document
0, 2, 4, 5, and 6 might