I\'d like to have a canonical place to pool information about Unicode support in various languages. Is it a part of the core language? Is it provided in libraries? Is it not
Perl has built-in Unicode support, mostly. Sort of. From perldoc:
perlunitut - Tutorial on using Unicode in Perl. Largely teaches in absolute terms about what you should and should not do as far as Unicode. Covers basics.
perlunifaq - Frequently asked questions about Unicode in Perl.
perluniintro - Introduction to Unicode in Perl. Less "preachy" than perlunitut.
perlunicode - For when you absolutely have to know everything there is to know about Unicode and Perl.