Not really a python guy myself either, but I know enough python & freetype to 
be trusted with commit access to freetype-py (I think I wrote about half of 
their bundled examples. A few years ago when I decided I wanted to learn 
pycairo, I rewrote all their existing examples from PIL+numpy to pycairo... so 
doubling the number) - that's the "x.freetype.x" part you are using below. So I 
read some freetype-py issues filed too.
If I remember correctly, pygame bundles their own rather old freetype-py fork 
in their "pygame.freetype." part, and possibly also a very old private 
libfreetype too. So problems you experienced might just be because of using old 
code (as in, freetype 2.5 era...).
You might want to check versions of both.
That path /usr/share/fonts/truetype/Sarai/Sarai.ttf looks linux - Debian or 
Ubuntu? They ship some fonts of questionable quality...

Lastly,  shameless plug: Font Validator is your friend...
I collects FontVal reports from all shipped fonts on fedora and ubuntu from 
time to time, specifically just the rasterizer/ hinting instructions part as 
FontVal's testing. I think the report for this font (just the hinting 
instructions part) might be filed under 
https://github.com/HinTak/FontVal-Tests-at-10pt/ already, under the Ubuntu or 
the fedora branch.

    On Friday, 30 June 2023 at 21:18:21 GMT+8, Werner LEMBERG <w...@gnu.org> 
wrote:  
> Thanks, but I'm not a Python guy, so I won't test this by myself.

> > font = pygame.freetype.Font("/usr/share/fonts/truetype/Sarai/Sarai.ttf", 50)

...  

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