... elsif (/size(\d+)/) {
	    $format->set_size($1); 
    } else ...

##</code><code>##

Argument "_size" isn't numeric in multiplication (*) at
        D:/Perl/site/lib/Spreadsheet/Format.pm line 225 (#1)

    (W numeric) The indicated string was fed as an argument to an operator that
    expected a numeric value instead.  If you're fortunate the message
    will identify which operator was so unfortunate.

##</code><code>##

	    $format->set_size(0+$1);