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What scenarios is the rpmspec `Requires` directive enforced?

Let's say I have mog.rpm with an rpmspec that defines the following Requires direction:

Requires: kupo >= 2.0

I know the Requires is enforced on rpm installation/upgrade. Is it enforced at any other time? For example, if kupo v2.0 has some regression and I downgrade it to kupo v1.9 , will the Requires directive in mog.rpm prevent the downgrade? Or is that only enforced when changes (ie installation/upgrade/downgrade) are being made to mog.rpm ?

Yes, it is enforced all the time.

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