WWW::MechanizeのUTF8

#!/usr/bin/perl -w

use strict;
use WWW::Mechanize;

my $mech = WWW::Mechanize->new();
$mech->agent_alias('Windows IE 6');

my $start = "http://127.0.0.1/test.html"; # UTF8のコンテンツ
$mech->get($start);

これだけで
Parsing of undecoded UTF-8 will give garbage when decoding entities at /usr/lib/perl5/site_perl/5.8.5/LWP/Protocol.pm line 114.
Parsing of undecoded UTF-8 will give garbage when decoding entities at /usr/lib/perl5/site_perl/5.8.5/cygwin-thread-multi-64int/HTML/PullParser.pm line 83.
Parsing of undecoded UTF-8 will give garbage when decoding entities at /usr/lib/perl5/site_perl/5.8.5/cygwin-thread-multi-64int/HTML/PullParser.pm line 83.
Parsing of undecoded UTF-8 will give garbage when decoding entities at /usr/lib/perl5/site_perl/5.8.5/cygwin-thread-multi-64int/HTML/PullParser.pm line 83.

こんなエラーになる。とりあえずperl本体とライブラリを最新化してみよう。