Fixes an issue that arose when converting a HTML file with a generated barcode, to a PDF using wkhtmltopdf. Older versions of ECMAScript, (older than ECMAScript 5), uses the octal radix (8) as default when the string begins with "0". When using wkhtmltopdf "08" was converted to "0" and not "8". This fix ensures that strings are always assumed to be decimals.