Convert lists to repeated arguments

[levitsky]

Hi, thank you for this software.
I am trying to convert a Namespace from argparse back into arguments. It works really well but I have this one repeatable argument implemented as follows:

parser.add_argument('--foo', action='append')

Hence, in the namespace I have a list under 'foo'. Would be cool if I could then get the repeated argument back from argunparse. Do you think it would make sense to add this?