safe
fun <T> CSHasDestruct.safe(property: CSProperty<T>, @AnyThread onChangeUnsafe: (value: T) -> Unit? = null): CSSafeProperty<T>
fun <T> CSProperty<T>.safe(parent: CSHasDestruct, @AnyThread onChangeUnsafe: (value: T) -> Unit? = null): CSSafeProperty<T>