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Why is Gnome fractional scaling 1.7518248558044434 instead of 1.75?
(unix.stackexchange.com)
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As the answer in the link explains, it's adjustment of your scaling factor to the nearest whole pixel, plus a loss of precision rounding to/from single/double floating point values.
So I'm not really sure of the point of this post. It's not a question, as the link quite effectively answers it. It's more just "here's why your scaling factor looks weird in your gnome config file", and it's primarily the first reason - rounding to whole pixels.