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I mean, an application could exist where this isn't even wrong. Maybe as a "subroutine" of another algorithm that only needs a truly composite number most of the time to work.
That this reads as a joke says a lot about what application we're intuitively expecting.
Edit: Not sure why this is being downvoted.
Edit: Not sure why this is being downvoted.
Perhaps because it would do better, being replaced with noop.
A link time optimiser might actually do so.
