This is a follow up of my Lost in encodings question.

Thanks to the answers given there I was able to solve that issue, but now I'm clueless again as I now need to read in compressed (gzip) UTF-8 files and I do not know how to convince perl to read them as UTF-8.

My code for opening the files is:

    open my $in, '<:utf8', $filename or die "Can't read $filename: $!\
+n";
    if ($filename=~/\.gz$/) {
        $in= new IO::Uncompress::Gunzip $in, { AutoClose => 1 };
    }
[download]

When reading uncompressed data, it works fine as I could verify with the help given in my previous thread. I did so by setting the debugger to UTF-8. When reading uncompressed data the Umlaut "ü" is correctly displayed as "ü". When reading the same data from a compressed file the "ü" is displayed as "ü".

I have no idea how to make perl consider the compressed data as UTF-8?