+=item *
+
+Some of the flags parameters to the uvuni_to_utf8_flags() and
+utf8n_to_uvuni() have changed. This is a result of Perl now allowing
+internal storage and manipulation of code points that are problematic
+in some situations. Hence, the default actions for these functions has
+been complemented to allow these code points. The new flags are
+documented in L<perlapi>. Code that requires the problematic code
+points to be rejected needs to change to use these flags. Some flag
+names are retained for backward source compatibility, though they do
+nothing, as they are now the default. However the flags
+C<UNICODE_ALLOW_FDD0>, C<UNICODE_ALLOW_FFFF>, C<UNICODE_ILLEGAL>, and
+C<UNICODE_IS_ILLEGAL> have been removed, as they stem from a
+fundamentally broken model of how the Unicode non-character code points
+should be handled, which is now described in
+L<perlunicode/Non-character code points>. See also L</Selected Bug Fixes>.
+