Unable to load newer fonts in Zend_Pdf

[dretsa]

If you try to load a newer font using Zend_Pdf, you get an error Unable to read version 4 table. The check is done at:

/library/Zend/Pdf/FileParser/Font/OpenType.php:555

This is because newer fonts use OS/2 table version 4, which is similar to 3. There are no structural differences between OS/2 v3 and OS/2 v4. Changing the value on the if statement will make fonts work most of the time. There are some specification differences, although and I can't find any information on how they differ.

I am trying to use the font Inter in my PDFs.

I've searched for a way to convert from v4 to v3 but can't find any easy way to do so. Would it be hard to implement this change?