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#15 Show default values in help output
Original request in: https://sourceforge.net/p/tclap/discussion/261541/thread/94637d85/
This becomes somewhat complicated with all the different types of Args. I think it is not worth the effort (if this is desired it can easily be added manually to the help string). If there are more requests for this, I think the best way would be to add a virtual method to Arg, something like descriptionWithDefaultValue() and then let each Arg type override that. Alternatively have a variable in Arg that gets set by each sub-class (like we do for some other things).