'.' concatenation seems to fail with 2 unicode strings

Hi,

  I am quite new to unicode, and although I'm a confirmed Perl
  programmer this seems to be quite a mind fuck ;-)

    Just a very simple script:

    #!/usr/bin/perl
    use utf8;
    use strict;

    print "Content-Type: text/plain; charset=UTF-8\n\n";

    # 8712 is the mathematical 'belongs to' symbol
    my $unicode_char1 = chr (8712);
    my $unicode_char2 = chr (8712);

    print $unicode_char1, "\n";
    print $unicode_char2, "\n";
    print $unicode_char1 . $unicode_char2, "\n";


The concatenation doesn't work!
Tested on the command line and in mozilla browser (which has quite good
unicode support)

However, using Unicode::String and the append() method seems to work
fine. I am using Perl 5.6.0

Any ideas?
Cheers,
        
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