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        my ($fh, $layers) = @_;

        my $unix_utf8_crlf = @$layers > 4
          && $layers->[0] eq 'unix'
          && $layers->[1] eq 'crlf'
          && $layers->[2] eq 'utf8'
          && $layers->[3] eq 'unix'
          && $layers->[4] eq 'encoding(utf8)' ? 1 : 0;

        if ($unix_utf8_crlf and $^O eq 'MSWin32') {
            binmode($fh, ':unix:encoding(utf8):crlf');
        }
        else {
            # _debug("# requested layers (@{$layers}) for @{[fileno $fh]}\n");
            my %seen = ( unix => 1, perlio => 1 ); # filter these out
            my @unique = grep { !$seen{$_}++ } @$layers;
            # _debug("# applying unique layers (@unique) to @{[fileno $fh]}\n");
            binmode($fh, join(":", ":raw", @unique));
        }
    };

    1;
EOT
}

our @ISA = qw/Exporter/;
our @EXPORT_OK = keys %api;
our %EXPORT_TAGS = ( 'all' => \@EXPORT_OK );