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

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 oper
+ator that
    expected a numeric value instead.  If you're fortunate the message
    will identify which operator was so unfortunate.

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