fun isSystemPropertyLoaded(key: String) = mode.toTrackingMode().isSystemPropertyLoaded(key)

    fun getLoadedPropertyOldValue(key: String) = mode.toTrackingMode().getLoadedPropertyOldValue(key)

    fun loadFrom(storedState: CachedEnvironmentState) = mode.toRestoringMode().loadFrom(storedState)

    fun getCachedState() = mode.toTrackingMode().getCachedState()

                // Thus, as a configuration input is an old value of property at load moment.
                environmentChangeTracker.getLoadedPropertyOldValue(key)
            } else {
                value
            }

        sink().systemPropertyRead(key, propertyValue)
        reportUniqueSystemPropertyInput(key, consumer)
    }