Implement a CallbackRef holding a reference counted (specialized?) Callback object...
Implement a call() method variant using Request/Result references?
Review this file/classes.
Reimplement functions in PathUtils to not to execute commands!
Any idea how to implement this as template class like ValueRangeCheck<Int64>(min, max) inclusive a proper differentiation of the string conversion function... value.toUInt64() vs. value.toInt64() ?