class CachedEnvironmentState(val cleared: Boolean, val updates: List<SystemPropertySet>, val removals: List<SystemPropertyRemove>)

    sealed class SystemPropertyChange

    sealed class SystemPropertySet(val key: Any, val value: Any?, val location: PropertyTrace) : SystemPropertyChange()

    class SystemPropertyMutate(key: Any, value: Any?, location: PropertyTrace) : SystemPropertySet(key, value, location)