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Subject: Re: Changing string from completing-read to height for
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> Date: Sun, 23 Jun 2024 10:36:30 +0000
> From: Heime <heimeborgia@protonmail.com>
> 
> I am using the function falfont to change the font of a buffer or frame.
> 
> Do I need to change face-height to an integer rather than keeping it as a string ?

Yes.