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kotlinlang

From <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.native.concurrent/-atomic-reference/value.html>

&gt; The referenced value. Gets the value or sets the new value. If new value is not null, it must be frozen *or permanent object*.
What is a permanent object? I have not seen that language used elsewhere before

I suspect it's an object declared with the `object` keyword, but not certain

May also refer to literal values?
```val a = false

AtomicReference(a) // throws InvalidMutabilityException

AtomicReference(false) // does not throw exception```

Regardless it would be nice to get some clarification from JB on this.

Permanent object is compile-time instantiated object, String literals, some boxed integers and few other objects, such as stateless singletons fall into this category.