+C<isn't> (the sub C<t> in package C<isn>) is not aliased to L</isnt>.
+
+=item *
+
L</like> and L</unlike> don't special case regular expressions that are passed as C<'/.../'> strings.
A string regexp argument is always treated as the source of the regexp, making C<like $text, $rx> and C<like $text, qr[$rx]> equivalent to each other and to C<cmp_ok $text, '=~', $rx> (and likewise for C<unlike>).