=item *
-They have some tricks Perl doesn't yet implement like character
-class subtraction.
+UTF-8 identifier names should probably be canonized: NFC?
- http://www.unicode.org/unicode/reports/tr18/
+=item *
+
+UTF-8 in package names and sub names? The first is problematic
+because of the mapping to pathnames, ditto for the second one is
+one does autosplitting, for example.
=back
See L<perlunicode/UNICODE REGULAR EXPRESSION SUPPORT LEVEL> for what's
there and what's missing. Almost all of Levels 2 and 3 is missing,
and as of 5.8.0 not even all of Level 1 is there.
+They have some tricks Perl doesn't yet implement like character
+class subtraction.
+
+ http://www.unicode.org/unicode/reports/tr18/
=head2 use Thread for iThreads