Simplified improvement for absint() that always returns an int

[josephscott]

With a long list of tests

https://core.trac.wordpress.org/ticket/65826

This will cause return values to change compared to the old absint() - https://3v4l.org/MssWC - because the old one wasn't actually limited to returning only an int

AI assistance: Yes
Tool(s): Claude
Model(s): Fable 5
Used for: Discussion on potential approaches on how to fix absint() to only return an int in a more simplified way. Claude also wrote all of the new tests.

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