Class
Common
```kotlin
@MustBeDocumented
@Target(AnnotationTarget.CLASS)
@StableMarker
public annotation class Immutable
```
`Immutable` can be used to mark class as producing immutable instances. The immutability of the
class is not validated and is a promise by the type that all publicly accessible properties and
fields will not change after the instance is constructed. This is a stronger promise than `val`
as it promises that the value will never change not only that values cannot be changed through a
setter.
`Immutable` is used by composition which enables composition optimizations that can be performed
based on the assumption that values read from the type will not change. See `StableMarker` for
additional details.
`data` classes that only contain `val` properties that do not have custom getters can safely be
marked as `Immutable` if the types of properties are either primitive types or also `Immutable`:
Marking `Person` immutable allows calls the `PersonView` `androidx.compose.runtime.Composable`
function to be skipped if it is the same `person` as it was during the last composition.