Allow only one post with specific meta value

I want this condition to only be applied to one post, i.e. when the
user declares a post as “featured”, and saves it, all the other ones
(theoretically only the last one) that have this meta value checked,
should be turned “off”.

You might then try to save the one and only featured post ID as an option instead.

Then you don’t need to pollute the post meta table with multiple false values.

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