Keep Glyphs CP and wildcard

I want to keep all glyphs from Latin and Cyrillic scripts, along with glyphs that don’t have a specific script assigned, such as numbers and punctuation. I’m currently using the ‘Keep Glyphs CP’ feature with the following settings:


However, I’m unsure how to include glyphs without an assigned script. I’ve tried script=none, script=None, and script="", but none of these work. How can I achieve this?"

I needed to adjust the filtering code to be able to do script=None.

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Perfect, thanks @GeorgSeifert