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Piotr and I have some questions regarding so called "PIR": What is it? Is it safe to disable it?

I see disabling it doesn't spoil anything visible. Only `out-pir` dir stops to be generated during box testing

And a follow-up question: how does it relate to our Python backend? :)

<https://github.com/JetBrains/kotlin/blob/92d200e093c693b3c06e53a39e0b0973b84c7ec5/compiler/ir/ir.tree.persistent/generator/build.gradle.kts#L15|this> gave me some clue:
```val generatePir by generator("org.jetbrains.kotlin.ir.persistentIrGenerator.MainKt", mainSourceSet)```
PIR = Persistent IR? I understand "persistent" as something that can be persisted aka. serialized and stored somewhere

Actually I don't know nothing about it. Maybe <@U0ANUS2BA> can help?

Yes, it’s the persistent IR, which can be used to get a view of any declaration at a time of any lowering. It’s used to implement incremental compilation support in JS IR backend. It’s not used in JVM, and I think it’s not used in Native.

Thank you! So I guess it's save to disable it for now in Python box tests