Writing a link to a merged cell with Spreadsheet::WriteExcel

I can't seem to get the write_url_range() function from Spreadsheet::WriteExcel (v. 2.20) to operate as expected:

#!/usr/bin/perl -w
use strict;
use Spreadsheet::WriteExcel;

my $workbook = Spreadsheet::WriteExcel->new("my_excelfile.xls");
my $mysheet = $workbook->add_worksheet("mysheet");

my $merged_hdr = $workbook->add_format(
    align => 'center',
    bold => '1',
    color => 'blue',
);

#$mysheet->merge_range('M5:N5', "EC number(s)", $merged_hdr);
## merge_range works correctly; puts token "EC number(s)" in M5:N5 merged cell

#$mysheet->write_url('M5', "http://www.chem.qmul.ac.uk/iubmb/enzyme/", "EC number(s)", $merged_hdr);
# write_url works correctly, writes link to http://www.chem.qmul.ac.uk/iubmb/enzyme/ with token "EC number(s)" at M5.
 
$mysheet->write_url_range('M5:N5', "http://www.chem.qmul.ac.uk/iubmb/enzyme/", "EC number(s)", $merged_hdr);
## write_url_range fails, puts token with link at M5, no merge -- same result as write_url

__END__


In the example above, I'm trying to merge cells M5 and N5, and have the contents of this merged cell be a link identified as "EC Number(s)".  However, the result of write_url_range() is the same as the result of write_url() -- the link and cell title is written correctly, but only to cell M5; no merge occurs.

Anyone have any ideas?
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